“Do you remember me telling you we are practicing non-verbal spells, Potter?""Yes,"said Harry stiffly."Yes, sir.""There's no need to call me "sir"Professor."The words had escaped him before he knew what he was saying.”
J.K. Rowling
rebellionsarcasm humor
More by J.K. Rowling

“If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.”

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“It is our choices, Harry, that show what we truly are, far more than our abilities.”

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“It does not do to dwell on dreams and forget to live.”

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“I solemnly swear that I am up to no good.”

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“It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.”

J.K. Rowling