TEACHER: John, why are you doing your math multiplication on the floor?

JOHN: You told me to do it without using tables.

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TEACHER: Donald, what is the chemical formula for water?

DONALD: H I J K L M N O.

TEACHER: What are you talking about?

DONALD: Yesterday you said it's H to O.

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TEACHER: Now, Simon, tell me frankly, do you say prayers before eating?

SIMON: No sir, I don't have to, my Mum is a good cook.