"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!"
"Youth can not know how age thinks and feels. But old men are guilty if they forget what it was to be young."
"Is it true that you shouted at Professor Umbridge?""Yes.""You called her a liar?""Yes.""You told her He Who Must Not Be Named is back?""Yes.""Have a biscuit, Potter."
"You're a prefect? Oh Ronnie! That's everyone in the family!""What are Fred and I? Next door neighbors?"
"Give her hell from us, Peeves."
"Hello, Harry"said George, beaming at him. "We thought we heard your dulcet tones.""You don't want to bottle up your anger like that, Harry, let it all out,"said Fred, also beaming. "There might be a couple of people fifty miles away who didn't hear you."