Disclaimer : I don't own it.

Note : I got this idea from hummergrey's 'If an Autobot, do NOT do the following', chapter 44. Just a mention of a prank that turned Autobots... Well, I'm not gonna give it away. Read on, and/or read hummergrey's fic. :) Also, Sides and Sunny's 'costumes' are her idea, not mine.

Oh, and I know it's a little early, but HAPPY HALLOWEEN!

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(Mikaela's POV)

I looked up, smirking as Sam helped Will set up the streamers that would hang from the ceiling. I watched my husband as he climbed the ladder and reached up to tape the streamer to a corner of the ceiling, causing his shirt to rise a little and expose a delicious strip of flesh around his waist. Thinking about it, I couldn't help but giggle quietly, remembering what I'd so blatantly told him I was into boys with big arms.

He was never that big a guy, muscular wise, but he had a heart that more than made up for it, and I loved him for who he was. He'd also bulked up a little, with all the running and exercise the events in Egypt.

Wincing a little, I looked down at the costume I was working on, for Mojo. He died that day. I shuddered a little, and then smirked at the irony of his costume. He gets to be a zombie, and me a vampire. At least we'll match...sorta. Sewing another leg into the costume, I began thinking again.

The Autobots were invited, and they wanted to experience Halloween. One problem, they're a little too big for any costume. I looked at the book in front of me, listing all kinds of costume ideas. This'll be their first Halloween, we should make it memberable.

Suddenly, I stopped what I was doing.

Glancing up, I saw Sarah and Annabelle giggling as they worked on cookies. Will and Epps were blowing up balloons using a helium machine, and then sucking the helium out of the balloons and talking casually in chipmunk voices -which of course made everyone who noticed laugh their asses off. Maggie and Glen were over programming something into a computer and discussing healthy food options, as Ratchet would have a fit if it was all candy. Then there were the Witwicky parents, fitting mojo with more bling, and talking about the party this night.

A slow smirk crossed my features when I realized we had everything we needed to pull the ultimate prank. Then I bit my lips. Except it'll be pretty much impossible to get half the bots with them online and functional, and no one bot will help us if he's gonna be a target, too. And I wanted to include them all. The question was, how to get them to cooperate?

The answer seemed simple. Make sure they know it won't interfere with any of their systems.

But again, that would involve informing them. Most of the bots wouldn't agree to it.

"Maggie?" I called slightly, waving her over and blowing a kiss at Sam, who'd turned as well. When the blonde woman sat down next to me, I looked at her a long moment. "Do the Autobots go offline at all, before the party?" Just spitting it out seemed best, at the moment. "Like a recharge or anything?"

She nodded a little, looking thoughtful. "I believe they're doing it in shifts. A third of the bots will be recharging at 1700 hours, then the second group at 1800 and the final at 1900, that way they'll all be fully functional for the party."

I nodded a little. "You wouldn't happen to be able to get a list of who's recharging where, would you?"

Maggie stared at me suspiciously a moment. I don't know what my face showed, but she slowly nodded, a small smirk toying at the corners of her mouth. "I can. It should be simple, really, there'll be a roster so all Autobots know."

"Ok." I mentally ran over instructions Ratchet gave in reprogramming the trans-scanner for their alternate forms, which was surprisingly simple compared to Autobot surgery. "Can you help me...." I looked around, ignoring the wary looks the other people in the room were shooting us, and making sure no Autobots were in hearing range. "Reprogramm their trans-scanners?"

"Why?"

Why not? "Because it's a Halloween party. It's just not traditional to show up without a costume." I smirked again.

Her eyes widened a moment, before narrowing. "I think I can have something ready in the next hour, if you want to grab the tools?"

I nodded, and her smirk broadened darkly. We spoke about involving the others, and decided Glen would work best as a distraction. Also known as, we'd send him to get some random information from Ratchet while I snuck in behind and grabbed the tools necessary. Sam would keep Optimus busy so Will and Robert could sneak in and steal Autobot physiology schematics that we knew were in one of the drawers in his dresser. Judy and Ron would simply keep Wheeljack distracted by allowing him to exray Mojo, which luckily was harmless.

We split into our groups, each wearing what I'm sure were identical smirks, and went our separate ways with instructions to meet back up here at 1400 hours. That would give us two hours to accomplish our planning and ready ourselves.

This wouldn't be easy, but it was our mission and we would not fail.

(Optimus Prime's Quarters, 1900 Hours)

"You know, I didn't think this would be so difficult." I whispered to Maggie, absently wiping sweat from my face and leaning in, squinting through the goggles as I carefully switched a couple of wires.

"It wouldn't have been...." She shot me an equally as tired look. "If it was one Autobot. We've already done Ratchet, Ironhide, Prowl, the minor twins, Jolt, the Arcee triplets..." She hastily set up the scan, and I held up the object to be scanned. Aiming it, she let the scanner run over the object, and then began recovering the area we'd opened up.

"Let's not forget Bumblebee, Jazz, Sideswipe and Sunstreaker." I hissed, picking up the tools and carefully pausing at the edge of the berth. Climbing down was a hassle, but amazingly enough I managed it somehow.

Maggie followed after, with a nod. "You're telling me." She flexed her fingers a little and winced, before gesturing to the door, and we hurried out. "I thought I was gonna have a heart attack when Ratchet fidgeted. I thought he was waking up on me."

I giggled a little. "Imagine how I felt when Bumblebee decided to turn over, with me standing on his chest." Looking down, I rubbed at my ankle a little, which was still aching from the fall. "I was just lucky not to end up with a broken leg."

"Who would have thought Autobots were fidgety sleepers?"

Giggling again, we split up after exchanging a high five, and headed to our rooms, where we got ready for the party. I hid the tools the best I could, cleaned up, then set to work on the complex make-up that would give me the pale white skin of a vampire. I eyed the gown in the corner of the room, with the long blood red skirt and black lace corset body, and smirked again before getting back to work.

(The Party, Later)

Sarah smirked as she looked over at us. Ironhide was crouched low, looking at Annabelle intently, poking at her extremely gently and looking confused at her constume. "Apparently he doesn't get the 'one pea in a pod' thing." She murmured, watching as her daughter clutched one of the green 'pea's and squirmed in her little 'pod'. "So how's it work, anyways?"

I smirked and tugged the bodice of my dress a little, to sit more comfortably. "They'll transform into their vehicle modes, to take us to the main party, and when they transform back..." I raised an eyebrow, smiling devilishly when Ironhide's head swung up, and he blinked at Will, who was dressed as a soldier.

Bumblebee walked into the room, rubbing at his head a moment, and then paused. His eyes landed on Sam, as my zombie-husband walked over, and widened considerably. With an almost miserable warble, he ran over and collapsed to his knee, his hands framing Sam and running close to him, but acting like he was afraid to touch him.

Sam for his part looked amused, and only slightly confused. "Bee?"

'Shhh! Shhh! Don't try to talk.' The unknown man's voice was low and almost soothing, coming out of Bee's speakers, before the little yellow bot turned away and began screeching and clicking. 'Medic! Medic!'

Ratchet came racing into the room and skidded to a stop next to Bee, crouching down. He clicked and whirrled to the youngling, before turning wide eyes on Sam. "What the pit?! Sam, what happened to you?" He froze a moment, then frowned. "Slag! It seems my scans are malfunctioning. They are telling me you're fine, but I can see the injuries!"

I blinked a moment, then busted up laughing. I could hear a few of the others laughing as well, as Sam tried to dodge an insistent metal hand, as well as explain. It took him a few moments, and in that time, the rest of the Autobots arrived.

Kissing Sam on the cheek, I bid him 'I'll see you soon' as I went over to Optimus. He already knew about the plan, so he climbed into Bee, and I carefully climbed into the warm, humming cab of the semi.

"Mikeala. It's good to see you again, although I am surprised you are not riding with your husband."

I smiled and patted the dash slightly, leaning back as the seatbelt slid down and over me on it's own. "Oh, I just had something I wanted to talk to you about." More like...check and make sure you weren't gonna kill me.

"Oh?" He moved out behind Ironhide and before the Corvette twins as we made our way towards the beach, where we'd set up the main party.

After all, what was a Halloween party on a military base? Well, ok, it was probably pretty good, but still... It was a nice night out. "Yeah, you see... The other humans and I got together and pulled a prank on you guys."

The truck engine spluttered and swerved, causing Sideswipe to honk his horn angrily, and Ironhide to swerve to the side and slam on the brakes. There was silence a moment as Optimus seemed to be telling them something, and then we pulled back onto the road.

"Don't worry!" I hurried to assure him. "It won't harm any of your systems or leave you vulnerable or anything."

"What did you do?" His tone was grim and wary.

Smirking a little, I shrugged. "You'll see. I just wanted to make sure you knew, and you can't kill us.....right?" I bit my lip a little, wondering if there was a loop hole in that, that I didn't know about. When the truck remained suspiciously quiet, I felt my eyes narrow. Right...?!

Then he seemed to sigh. "You are correct. I sincerely doubt many of us will be happy, but we will not harm you." Then there was a low chuckle. "However, you might just end up pranked yourselves."

"We can take it." I smirked, glancing back at the Corvettes behind me.

"Ah, yes, I heard about your little prank on the twins. Very nicely done. Ratchet is still laughing about it, and you even got Prowl to chuckle." A low laugh reached my ears and the semi seemed to shake a little.

I smirked even bigger as we arrived at the beach. "What can I say? They know better now, I hope." As the seatbelt released me, I patted the dash again before climbing out and heading towards Sam. As I approached his side, I saw that he was laughing his ass off. "Show time."

And indeed, the show began.

With the sound of gears rearranging, the Autobots all began to change. However, instead of changing into their usual forms, their metallic armor shifted differently, changing shape and color where needed. The arms and legs appeared where they should, and all the humans stared in shock at what emerged.

"What?" Ironhide glared down at us, his eyes glowing darkly and his voice gruff. However, his usual frightening exterior did nothing to qwell the laughter of the humans as they took in his form.

"Nice tutu." Sarah snickered under her breath.

Bumblebee tilted his head a little, the center of a bunch of human girls cooing and 'aww'ing over his form. He blinked a little, his wings shifting and causing more 'awwww's of adoration.

People snickered and giggled at the clueless Corvette twins, who glared and stared down at them, and frowned in confusion.

Already having a heads up, Optimus looked around. His eye widened in shock, horror and amusement, and his jaw hung slackly as he took in the others. Immediately, his eye went dim, and I knew he was looking something up.

"Arrr! Shiver me timbers!" Epps cried, staring at Optimus. "Nice eye patch."

Blinking, Optimus looked down at himself, before narrowing his eye at me. "Thanks." He blinked again, a truly odd sight.

Then again, the currently costume-ized Autobots were a truly odd sight in themselves.

Walking over, Will turned to me and Maggie. The Major was dressed in his formal military gear, and Maggie was dressed up as a bar wench. "So, do I need to ask?" He took a good look at Ironhide, and nearly doubled over in choked laughter.

I smirked and began explaining, pointing to each bot as I went. "Optimus Prime, the pirate, obviously." The leader of the Autobots blinked down at me with a pirate's hat on, an eye patch, and a metallic peg leg. I giggled. "Bumblebee the Bumblebee." Bee's armor was striped more than usual, with rounder, puffier looking wings. He also had a flexible stinger and his antennai were elongated. Not very original but damn he was cute!

People cooed at the little scout, who looked down, made an odd little grunt, and then began flapping his door wings more.

Ironhide, finally getting the hint, looked down. Despite the laughter on the beach, he growled lowly, his optics flashing red as he took in his form.

"Ratchet, the-" I snickered and then giggled. "Stuffed teddy bear doctor." People laughed at the big fuzzy ears and white doctor coat.

Looking down, he glared and reached for his wrench, holding it up without even looking. "Yes, that's it, keep laughing." He muttered warningly, his eyes narrowed as he adjusted the stethoscope hanging around his neck with big stuffed paws.

When people indeed kept laughing, he glanced out of the corner of his eye and his eyes widened in horror. He took in what he'd thought was the wrench, glowering at people when he found out it was a really big lolipop instead.

"Ironhide the tooth fairy." Epps actually laughed so hard, he fell over. Ironhide snarled, but not even Prowl could keep a straight face when taking in the massive pink tutu, pink slipper shoes and pink wand sticking out of one of Hide's cannons. Said second in command shook his head, returning his gaze to me, although his head was smoking like a chimney.

"We didn't bother with Prowl." I shrugged a little. "I couldn't really think of what to make him." Besides, Sam's already a zombie, and I didn't wanna piss off the Autobot who could lock me in the brig for a month.. And that had been the only real idea I had. "Jazz is....well, a jazz man." Again zombie was taken. Jazz was wearing a long black leather coat with his visor shaped into sunglasses, and a beret hanging off one horn.

Maggie nodded and giggled. "Sunstreaker's a bat." She snickered at the tiny bird-like legs and big black wings. In fact, the entire body was black, and his optics were tinted yellow as he glared down at her, hissing and baring fangs. "Sideswipe's a pumpkin." Sides looked down at his decidedly much fatter body, his black, triangular eyes widening, and his jagged mouth dropping in horror at the orange of his armor.

"What the slag?! Which one of you did this??" Ironhide finally growled loudly.

With a smirk, I accepted a bottle of juice from Sam. "All of us were in on it, Hide." My smirk grew. "Even Will, Sarah and Annabelle." Though Annabelle had acted more like a distraction, while Sarah played the 'I've got so much to do, can you watch her for a second?' card.

His eyes widened anda horribly betrayed look crossed his face. He turned to his humans, who looked torn between being guilty and amused. "Why?!?!" He'd never sounded more vulnerable and betrayed than in that instant, and Sarah walked over with Annabelle the pea and patted his foot sympathetically, before cracking up at the sight of the pink 'slipper'.

Arcee and her sisters were dressed up as amazons, in skimpy armor that had all the mechs staring, whether they meant to or not, but rather than complaining, they seemed to be enjoying themselves.

"Bzzz!" Bumblebee's eyes were half closed, and he had a huge grin on his face, enjoying all the girls climbing all over him. 'Sweet little Bumblebee, I know what you want from me.' He swayed a little from his cross legged position on the ground.

I giggled as I saw the little Autobot scout clearly enjoying himself. Even Optimus' half glare -you can't very well fully glare with only one eye- melted as he took in the youngling. Skids, who was done up as a praying mantis, complete with little bent claws that pressed together in a praying motion, snickered at his brother, was even stockier than usual in his ladybug get up.

"Why would you do this?" Ratchet asked through gritted lip plates, looking down at his fluffy 'paws'.

I smirked up at him, leaning into Sam's arms. "One reason and one reason only." Exchanging a look with the others, I held up a hand and slowly counted down. "5...4...3...2...1..."

"HAPPY HALLOWEEN!" We all yelled, some people popping bottles of champagne and tossing handfuls of confetti in the air. While it seemed a little more festive, this was a party. After a little more complaining, most of the Autobots settled down, after I promised to personally work with Maggie to reverse this afterwards. Ironhide kept sulking, but Sarah and Annabelle stayed with him, enjoying themselves, and if you looked closely, you could see his lips trembling in a tiny smile.

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Hope you like it.

R+R please.

Thank you.

Tenshi