Funny Harry Potter Quotes?

I'm making a t-shirt of Harry Potter with my cousin for the 6th movie we're seeing the first day and I'm trying to think or say funny quotes from books or movies. However, not doing very well. Any ideas?

I like the first, when the Quirl teacher enters the room shouting, "Troll" and then right before he faints Sayd, "I thought he should know."

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