Disclaimer: I own nothing of Harry Potter—except my stories

A/N: So, here's my oneshot, which was kind of a spur-of-the-moment thing. Please read and review, if you like. (I know you like Snape, Myrtle, but he's awesome to prank).

Snape was getting more and more nasty. Ginny was appalled. I knew he was bad in my first year, when I first met him, because I was in Gryffindor, but still! How does he hate one group of students with such a passion?

Ginny pondered.

Eventually, it came to her. Fred and George! I'm only in second year, so I really don't want to screw up my record, but Fred and George have already ruined theirs. Plus, I think they'll want to help.

Ginny sidled up to her fifth-year twin brothers, who were busily scribbling away at their DADA homework in a table in the corner (a rarity). "Hey, guys. Can you…"

George looked at her warily. "If it's homework, no can do. We kind of left ours a little late, and the most difficult part of it happens to be due tomorrow morning, sis. Sorry."

"It's not homework."

"You look depressed."

"It's Snape."

"Oh. Okay. What's up?"

"I kind of want to do something completely evil to him."

Fred jumped into the conversation. "And what, may one ask, is the cause of this desire for destruction?"

"The fact that I mixed in the wrong ingredient into my antidote, he humiliated me in front of the class and gave me a zero with the aid of that Evanesco spell, Robert Newbury laughed at me, and I accidentally-on-purpose turned Newbury's hair blue…and may have made his front teeth fall out, of course with the aid of my fist. Then Snape gave me extra homework, which I had to finish for today, and of course, I was up until two last night!"

"What was the homework?"

"An essay on the composition and effects of the Polyjuice Potion. And we haven't studied that, so I had to stay up, mainly for extra research!"

"Ouch."

Hermione, who had been listening in, came over. "You should have asked Harry and Ron. They'd know the effects. And I could have told you about the composition."

Ginny coloured at the mention of Harry Potter, but her embarrassment soon left her as she thought over another question. She frowned at Hermione. "How do you know about the composition? And how do Ron and…H-Harry know the effects? You shouldn't have studied it that to that extent yet."

It was Hermione's turn to turn bright red. "Oh! Erm—never mind that. I'll just, um, go finish my Charms homework…" She rapidly left the table, looking rather guilty.

Fred and George grinned at Ginny. She was definitely going in the right direction. Besides, for a chance to do something to Snape, homework could always wait…

Snape woke up the next morning. He threw open his closet to find his usual black robes. He stared at the contents in surprise. "What the…?"

For, in place of his robes, there were several long, dark-coloured dresses, with large, dark shawls folded neatly on the top shelf.

Snape searched his room, frantically. There was no sign of his clothing anywhere. He yelled out his frustration. Snape was really not in the mood to go down to breakfast wearing a shirt that advertised a Weird Sisters concert and plaid boxer shorts, which were his current lovely little nightclothes.

Several floors above, on top a trapdoor that a certain silver ladder led to, Professor Trelawney was quite annoyed to find that several of her favourite shawls were missing, as well as a few dresses of hers.

"The indignity of it…"

Snape came down to breakfast, quite reluctantly. Ginny snickered. Fred nearly swallowed his spoon. George inhaled his orange juice.

Snape was wearing the Weird Sisters shirt and (tied over his boxer shorts) a purple, spangled shawl, worn rather like a sarong. Gold stars patterned the shawl. Fuzzy, orange socks (a Christmas present from Dumbledore, which he never used) were on his feet.

The teachers' reactions displayed amusement as well. Professor Dumbledore chuckled. Professor McGonagall smiled. Hagrid let out a loud, booming laugh. Professor Flitwick giggled. Professor Sinistra laughed. Professor Sprout whistled through her teeth and clapped. Professor Vector snorted loudly. Professor Lupin rolled around in hysterics.

Snape was turning red and seemed about to explode. But, it was too late; now the students were laughing hysterically too.

What made the situation even more entertaining was the fact that Trelawney came down to breakfast in quite a temper at that specific moment.

She stopped in shock to see Snape in his new ensemble—and recognized part of it.

She rushed down upon him like an eagle. "Thief! Robber! Bandit! So this is how my service is repaid! My own colleague steals from me! How dare you!"

Trelawney chased Snape across the Great Hall, screaming.

"And what have you done with my other belongings, vagabond? Hm? I suppose they are in your rooms? And why have you decided to come down in drag? I do not like this at all, Severus! You, you—thief!"

Snape was holding up his sarong as he sprinted, lest he trip, or it fall off.

"Oh, for Merlin's sake, woman!"

"Thief!"

"Ouch—no, stop, you insane, overgrown dragonfly!"

"VILLAIN!"

George stuck out his foot as Snape was running past the Gryffindor table…

"AAAAAAAAAAAAAAAAAAARRRRGH!"

Snape fell over onto the cold, stone floor. Trelawney pounced—and tore off her shawl, away from Snape. The Half-Blood Prince (though no one was aware of the title yet) became The Half-Clothed Potions Master. Angrily, Trelawney marched back to her tower.

Snape tried (as best he could) to cover his little plaid boxers, and his unusually red face, while everyone (including McGonagall) laughed.

The next week, the Gryffindor common room and the Great Hall were filled with enlarged, moving pictures of the whole incident: Snape coming down to the Great Hall in his interesting costume, the chase, Trelawney taking back her shawl, and Snape's ending embarrassment.

You see, reader, no one had noticed Colin Creevey snapping away with his camera during the whole scene.

And no one knew that he'd given the photos to Fred, George, and Ginny that night…