The professor nods and gets ready to call on someone else when someone yells from the back row of the auditorium, "A hundred and one."

The professor looks over his thick glasses but can't make out who had spoken. He calls on a fellow who says, "Seven."

And once again from the very back the guy yells, "A hundred and one."

The professor then calls on a very shy lady in front, who says, "Only one, sir. The man on top and woman on the bottom."

And the voice from the back shouts, "A hundred and two!"