Little Johnny walked into the kitchen, saw his mother making a cake and announced, I´ll be playing in my room for the next two hours. I sure would like a piece of cake when you´re finished.

Later, when his mother brought him a piece of cooled cake, Little Johnny exclaimed, Golly, it worked!

Puzzled, his mother asked, What do you mean?

Little Johnny replied, Daddy said that in order to get a piece around here, you have to spend a couple of hours playing first!