TEACHER: Maria, go to the

TEACHER: Maria, go to the map and find North America.
MARIA: Here it is.
TEACHER: Correct. Now class, who discovered America?
CLASS: Maria.
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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 Mom is a good ****.
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TEACHER: Harold, what do you call a person who keeps on talking when people are no longer interested?
HAROLD: A teacher