Chatting on a Plane

A man was seated next to a blonde on an airplane. Shortly after the take off, he turned to her 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 had just opened her book, closed it slowly and said to the man, “What would you like to talk about?” “Oh, I don’t know,” said the man. “How about nuclear power?” he smiled.
“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 man, visibly surprised by the blonde’s intelligence, thinks about it and says, “Hmmm, I have no idea.” To which the blonde replies, “Do you really feel qualified to discuss nuclear power when you don’t know crap?”