TEACHER: Why are you late, Frank?
FRANK: Because of the sign.
TEACHER: What sign?
FRANK: The one that says, “School Ahead, Go Slow.”
TEACHER: Maria, go to the map and find North America.
MARIA: Here it is.
TEACHER: Correct. Now class, who discovered America?
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.