Ferret
This story takes place when 'Professor Moody' turns Malfoy into a ferret. My form of events is a little different then what actually happened.
Moody, instead of turning Malfoy back, put a lock charm on his ferretishness and just pretended to turn him back. So, while Malfoy was still a ferret, he thought he was human.
'Come on, boys.' He said in a very high pitched, squeaky voice. 'We have to go to charms class.'
Moody had conveniently slipped away. Crab and Goyle either didn't want to hurt Malfoy's feelings by telling him he was still a ferret, or they were too stupid to think up the sentence.
When they were walking past a food tray, Crab and Goyle got distracted. While they were distracted, a first year saw Malfoy. She thought he was cute, so she put him in her bag and went to hide him in her dormitory. She took him out of her bag, but screamed and dropped him when he started talking.
'Put me down! Do you know who my father is? Put me down this instant!'
'But, ferrets don't talk….'
'Do I look like a ferret to you?'
'Well, actually, you do.' Malfoy opened his mouth to protest, then closed it again. He walked out of the dormitory, and a while later came to Moody's office.
'Change me back! Change me back!'
'Sorry, Malfoy, but I can't. I put a lock charm on it, so no one can undo the spell. You'll just have to go on living a magical ferrets life.'
After pouting for a while, Malfoy remembered that he had charms class. He ran as quickly as he could, but with his little legs it took him twenty minutes to get to charms. He walked in, and at first no body noticed. But, then one of the girls saw the blond ferret walking into class forty minutes late, and she screamed.
Flitwick had already heard about what happened, and understood why he was late. Malfoy sat down beside Crab and Goyle.
Halfway through the class, Flitwick heard an explosion. He looked over to see that, because of his tiny hands being unable to hold the wand properly, Malfoy had blown himself up. There were pieces of him everywhere. Eyes, ears, tail, fur, everything. Then, by some miracle, the pieces started putting themselves back together. But, as you can imagine, this is no easy task.
When Malfoy was finished putting himself back together, he resembled a Picasso painting.
Revenge is sweet.