Sorry... always forget to do this...
1. Some one in Slytherin must be kicked out and Snape and Dumbledore don't do it
2. The school becomes overrun with some kind of animal
3. A boy must run through the castle shrieking like a girl
4. Someone must leave the school to go on a reality show
5. Snitchsneeker must come up in the story 5 times!