classroom jokes

TEACHER: Why are you late, Frank?
FRANK: Because of the sign.
TEACHER: What sign?
FRANK: The one that says, "School Ahead, Go Slow."

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.

TEACHER: Can anybody give an example of COINCIDENCE?
TINO: Sir, my Mother and Father got married on the same day, same time