A guy was seated next to an attractive blonde lady on an airplane. Being bored, he turned to the blonde and said, "Let's talk. I've heard that flights go quicker if you strike up a conversation with your fellow passenger."
The blonde, who was reading a book, closed it slowly and said to the guy, "What would you like to talk about?"
Oh, I don't know," said the guy. "How about nuclear power?"
"OK," she said. "That could be an interesting topic. But let me ask you a question first. A horse, a cow and a deer all eat the same stuff... grass. Yet a deer excretes little pellets, while a cow turns out a flat patty, and a horse produces clumps of dried grass. Why do you suppose that is?"
The guy thought about it and said, "Hmmm, I have no idea."
To which the blonde replied, "Do you really feel qualified to discuss nuclear power when you don't know sh*t?"