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. (lovely child)
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TEACHER: Winnie, name one important thing we have today that we didn't have ten years ago.
WINNIE: Me!
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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
