The Idiom: Hindsight is 20/20. Requested by: Wolf of Sylvyr.

Ziva David, mysterious and badass Mossad operative, and Abby Scuito, Goth and forensic scientist extraordinaire, stood silently in the middle of the lab.

Neither spoke. You could hear a pin drop in ballistics. Not a machine beeped.

Without warning, Abby's burst of hysterical laughter shattered the silence. Five seconds later Ziva joined in, giggling madly as they looked around and surveyed the damage.

It was late. Abby had stayed to rush some results for Gibbs. Ziva had stumbled across her attempting to keep herself awake in the lab. The assassin-turned-investigator had volunteered to help. One thing led to another, and somehow the lab had ended up covered in gelatinous purple goo.

Ziva collapsed against the nearest table, clutching her side, while Abby tried to stifle her laughter in her hands, her pigtails bouncing as she shook her head. Her green eyes sparkled.

"What a mess!" the scientist choked out between peals of laughter.

"Do you even know what it is?"

"Er…"

Abby's uncertainty brought on another fit of insane laughter from the women, who were not only doused in the same purple goo as Abby's precious lab but also peppered with powdered sugar and speckled with permanent marker.

Ziva could not remember how this had happened. It had started with a trick involving mentos and coca-cola…and some superglue…and somehow gunpowder had joined the party…for some reason unknown to Ziva David, she and Abby had regressed to childhood.

And alcohol wasn't even involved. Just boredom, some sharpies, powdered sugar, mysterious goo, a smidgeon of peanut butter, and a spilt caf-pow!.

"How did we burn a hole in your shoe?" Ziva asked through giggles.

"I told you not to touch the hydrochloric acid!" Abby squealed, sinking to the floor. She slid in the sticky messy and chuckled, flopping onto her back.

What was the harm in getting even ickier? Everything was already a neat freak's nightmare.

"Harry is going to have a heart attack," Abby said, attempting to be apologetic.

"In two hours Gibbs will storm in here for results and you are worried about the janitor?" Ziva asked incredulously, stepping forward.

She slipped in the unknown substance they had given existence to and went down next to Abby with an uncharacteristic shriek. Abby shouted with laughter and elbowed Ziva good-naturedly. Ziva reached under her head and removed a box of latex gloves from under her neck, chucking them up to a counter.

"Jenny's going to be pissed."

"Tony will have a field day with what we could have been doing all night."

"McGee might actually pass out."

Abby shot upwards and grabbed Ziva's hand, dragging her Israeli friend up to a sitting position with her. She reached for Bert, who was also subject to a shower with purple stickiness, and hugged him. The hippo promptly farted.

She looked around the lab brightly. Ziva copied her, taking in the ungodly mess. What had they done? Abby's lab was destroyed. The equipment was working, but everything else…

"Er," Abby cleared her throat, attempting to school her features sternly. She turned to Ziva. "Maybe this wasn't such a brilliant idea."

Ziva lifted an eyebrow.

Of course it wasn't. It was the worst idea she'd ever had—and playing that prank on Gibbs last week had been spectacularly horrible.

But this had been bundles of fun.

"We really shouldn't have done this," Abby said, collapsing in giggles again.

"I suppose hindsight is 100/100!" Ziva snickered, smirking.

Abby laughed loudly, throwing Bert at Ziva. The stuffed animal settled in Ziva's lap.

"It is not!" Abby cried, beaming. "What kind of terrible eyesight do you have? Hindsight is 20/20! You can see better when you know the result!"

Ziva giggled. Their vision had certainly been very clouded.

"Now that we can see 20/20," Ziva mused, raising her dark eyebrows, "would you have still allowed this to happen?"

Abby paused and glanced around at the nightmare that was the NCIS forensics lab. She grinned wickedly.

"Hell yes," she said smartly.

Abby snatched Bert back and gave him a kiss. Ziva swept her hand along the floor and tossed a handful of purple goo at Abby. Abby shrieked and scrambled away on her hands on knees, leaving Bert behind at Ziva's mercy.

Ziva shifted onto her hands and knees as well and slipped after Abby, resuming their purple goo and powdered sugar fight. She made it to the bag of random sugar first and struggled to stand in the slick mess with a handful of white weaponry.

She chucked it. Abby ducked with a shout of triumph. Ziva froze instantly. Abby popped back up, smiling like a Cheshire, and paused when she saw the look on her goo-battle-arch-enemy's face. She cocked an eyebrow and whirled around like a dervish to the doorway, where Ziva was staring…

…and adopted the same terrified, solemn, and shocked look as the Israeli herself.

Neither Abby nor Ziva had ever endured a glare as fierce as the one they were getting from one powdered-sugar-coated Leroy Jethro Gibbs.

Abby slapped both hands over her mouth to supress in a loud giggle. Ziva just looked paralyzed with fear.

Hindsight may be 20/20, but this sight was infinitely better.

I swear I was completely sober when I wrote this...