A man was seated next to a kid in an airplane and said to the kid, "Let's talk." "O.K. What should we talk about?" the kid asked. "How about nuclear power?" the man replied, jokingly. "That's a very interesting topic," the kid said. "But let me ask you a question. Horses, cows, and deer all eat grass yet the deer excretes pellets, the cow-a flat patty, and the horse-clumps. Why?" "I don't know," the man replied. Smiling, the kid said: "Do you really feel qualified to discuss nuclear issues when you clearly don't know sh**?"