Funny Comeback

TEACHER: John, why are you doing your math multiplication on the floor? JOHN: You told me to do it without using tables.
TEACHER: Maria, go to the map and find North America.
MARIA: Here it is.
TEACHER: Correct. Now class, who discovered America?
CLASS: Maria.

TEACHER: Glenn, how do you spell “crocodile?”
GLENN: “K-R-O-K-O-D-I-A-L”
TEACHER: No, that’s wrong
GLENN: Maybe it’s wrong, but you asked me how I spell it.
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.