The arithmetic teacher proposed the following to the class, "If there are three crows on a fence and one is shot, how many would be left?"

After a short time, Little Johnny shouts out, "Two left."

The teachers response, "I'm afraid you don't get the point. Let me repeat the joke. There were three crows on a fence and one is shot, how many would be left?

Johnny replied again, "Two left."

Teacher, "No, none would be left, because when one is shot, the other two would fly away."

Johnny, "That's what I said, TWO LEFT!!!"