A farmer notices that his fence is falling down. It hasn’t fallen all the way down, but is only a foot off of the ground. He notices that his sheep are hopping the fence to get to the other pasture. As they are hopping the fence, one of the sheep catches the fence with its foot tearing the fence down. On their way back to the first pasture, the farmer notices the sheep did not hop. He decides to conduct an experiment with his sheep.