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Harry Potter:"Who is that? That man?"
Stan Shunpike:"Who is that? Who is?! That is Sirius Black that is! Don't tell me you've never been hearing of Sirius Black? He's a murderer. Got himself locked up in Azkaban for it. "
Harry Potter:"How did he escape? "
Stan Shunpike:"Well that's the question, isn't it? He's the first one that done it. He was a big supporter of You-Know-Who. Reckon you've heard of him?"
Harry Potter:"Yeah, him I've heard of."

Maid:"Housekeeping."
A huge roar answers
Maid:"I'll come back later."

Dumbledore:"A word of caution. Dementors are vicious creatures. They will not distinguish between the one they hunt and the one who gets in their way. Therefore I must warn each and every one of you to give them no reason to harm you. It is not in the nature of a Dementor to be forgiving. But you know happiness can be found even in the darkest of times, when one only remembers to turn on the light. "

Harry Potter:"Lumos Maxima!"

Harry Potter:"Mischief managed."

Harry Potter:"I solemnly swear that I'm up to no good."

Professor Snape:"That is the second time you have spoken out of turn, Miss Granger. Are you incapable of restraining yourself, or do you take pride in being an insufferable know-it-all?"
Ron Weasley:"He's got a point, you know."