and he says "Look son, first you swim full force at the human but at the last second, you turn away. Then you swim at him full force again, but again at the last second you swim away. Then you can go back and eat the human." The son looks confused and asks, "But dad, why can't we just go eat the human the first time?" Dad replies "Well, you can but why would you want to eat him when he's still full of shit?"