Kill the Spare
Twitchy little ferret, aren't you, Malfoy
Try taking your egg for a bath
Canary Creams - seven Sickles each
Setting Off Fireworks in Potions Class
I second "CONSTANT VIGILANCE!" and "POTTER STINKS."
And here are some of my own ideas...
Goblet of Fire
Watching a man pick his nose through omnioculars
Aiden Lynch gets ploughed.
Dragon vs. Little Wooden Stick
Being Rescued by Dobby, Part 1
Fraternising with the enemy
Are you going to finish that Bouillabaisse?
Lost in a maze
Cedric stops being handsome and starts being dead
The man with red eyes and no nose
Saved by the deus ex machina
Order of the Phoenix
Throwing a tantrum
Getting killed by a curtain
Weasley is our King
Tom Riddle was one creepy kid...
Snape kills Dumbledore
Tim the Enchanter
Bowing To Buckbeak
Ultimate Cosmic Power
Aunt Marge Makes A Better Blimpe...
Ok, I think I'm going to close this now... just because you'd have to get 132456874653 posts to reach some of these and I don't want to give Carole a target (crazy girl!)
Thank you all for your brilliant suggestions. They will be appearing for you all soon.