Your science class reads a silly story in which a mad scientist makes absurd conclusions about an experiment that he conducted. One at a time, he cuts off a frog's leg and commands it to jump. With three, two, and one leg, the frog obeys. Finally, when no legs are left, the frog does not move. The scientist concludes that having no legs causes a frog to be deaf. Use this story to lead into a discussion about scientific method and correlations.