One day the teacher said every Friday I will ask a question and whoever gets it right does not have to come to school on Monday. So on the first Friday she asked how many fish are in the ocean? No one answered. The next Friday she asked how many stars are in the sky? No one answered. So one of the students, Jack, he packed his school bag with two black ping pong balls. The next day, Friday, he dropped the balls before the teacher asked the question. So the teacher asked who's the comedian with the two black balls? So Jack answered, "Bill Cosby, see you next Tuesday."