The next Friday the teacher asked the question Please Explain Einsteins theory. No child could answer the question. The next Friday she asked ever a more difficult question. No correct answer was given.
Little Ronnie wanted so much to have a Monday off so on Thursday night he took two of he dads golf balls and painted them Black. On Friday just before the teacher was about to ask the question, little Ronnie took the golf balls out of his pocket and rolled them up to the front of the classroom having them bounce off the wall. The teacher got mad turned around to the class and yelled
OK who is the comedian with the two black balls
Ronnie stands up and shouts Flip Wilson and I will see you Tuesday.
P.S. Flip Wilson clearly dates me, you may have to update the comedian!!!