"Yeah, Quirrell was a great teacher. There was just that minor drawback of him having Lord Voldemort sticking out of the back of his head!" --Harry Potter
"Who told you 'bout Fluffy?" "Fluffy?" "That thing has a name?" - Hagrid, Ron and Hermione, "The Sorcerer's Stone"
"Montague's just been found in a toilet, Sir." --Draco Malfoy"
"Longbottom, if brains were gold, you'd be poorer than Weasley, and that's saying something." --Draco Malfoy
"I want to fix that in my memory forever. Draco Malfoy, the amazing bouncing ferret..." --Ron Weasley
"Viktor? Hasn't he asked you to call him Vicky yet?" --Ron Weasley
"Sunshine, daisies, butter mellow, turn this stupid, fat rat yellow." --Ron Weasley
"Accio Brain!" --Ron Weasley (haha like that'll work)
"Oy, pea-brain!" --Ron Weasley