What is your best dialogue from Harry Potter Books or the Movies and Why ?

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Well there are many dialogues in the entire saga of Harry Potter which are worth applause but there must be one which has taken your attention. I mostly like the dialogues of the negative characters in the books. They have been created amazingly by J K Rowling. My favourite is one of severus snape from the third book. When Harry yells "I told you to shut up about my dad. I know the truth, all right ? He saved your life. Dumbledore told me!" Snape replies as follows: "And did the Headmaster tell you the circumstances in which your father saved my life? Or did he considered the details too unpleasant for precious Potter's delicate ears ? " LOL, really cool dialogue. So which one is your favourite?