Children are quick:
TEACHER: Why are you late?
STUDENT: Class started before I got here.
TEACHER: John, why are you doing your math multiplication on the floor?
JOHN: You told me to do it without using tables.
TEACHER: Glenn, how do you spell 'crocodile?'
TEACHER: No, that's wrong
GLENN: Maybe it is wrong, but you asked me how I spell it.