Twinkle Toes

Harry, Ron and a strangely daring and out-of-character Hermione were hidden beneath the Invisibility Cloak outside Professor Snape's private quarters.  According to the Marauders Map, Snape was in bed within and had been for the last three hours.

Silently, Harry unlocked the door with a well-placed charm and the trio crept into the room.  Although they may as well have barged in guns a-blazing, horses whinnying and announced their arrival over a sound system for all the difference it would have made.  Snape snored loudly enough to wake the undead.

Hermione slipped into the bathroom while Harry and Ron explored the rest of the room, and she emerged minutes later clutching an empty bottle labelled 'Mr Magical Muscle Extra Strong Shampoo' and another bottle now filled with 'Mr Icky's Duel Purpose Hair and Axle Grease'. 

Thirty minutes and lots of charm practise later, and the deed was done.  All mirrors had been expertly enchanted to show only what the user expected, all portraits had been blackmailed into keeping quiet and Snape's alarm clock had been altered to squawk ten minutes before the end of breakfast.  All tracks had been covered.

*~*~*~*~*

The next morning, the full student body was greeted with the sight of a curly haired Snape dressed in pink 'I love One True Voice' robes and scowling not-so-menacingly at anyone who dared to blink in his presence.

By evening, he was still blissfully unaware that anything had changed.  That was, until his beloved kitten Twinkle Toes happily settled in his lap rather than fleeing terrified, tail between legs. 

"POTTER!" 

The yell reverberated around the whole Hogwarts castle from Dumbledore's office to the Chamber of Secrets.  Which was unfortunate for Snape because Harry was currently on the Quidditch Pitch snogging Draco Malfoy.