"I will not tell everyone that Professor Trelawney is the reason why the rum is always gone." <-- I always did wonder if there were a connection...
"I will not compare George Weasley to Vincent Van Gogh." <-- That's the same thing I thought when he lost his ear. I'm such a terrible person. x)
"I will not drape myself in chocolate to try and entice Remus Lupin." <-- I would totally do that, too. I <3 Remus... ^_^
"I will not make up a match.com profile for Snape, and show it to him, telling him to 'get over it.'" <-- x3
"I will not make any jokes about Lupin and his "time of the month""
"Dumbledore does not have "nakie time."" <-- Potter Puppet Pals = LOVE.
"In the beginning of each year i will not run behind snape yelling "daddy i'm home!" and hug him. it will only get me detention." <-- I'd do that, also. -drool-
"I will not wear 'snapes #1 fan' t-shirt to potions"

These ones all made me laugh my head off. xD