Two strangers were seated next to each other on the plane.

The guy turned to the cute blonde next to him and made his move. "Let's
talk." He said. "I've heard that flights will 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 guy, "What would you like to discuss?"

"Oh, I don't know," said the passenger. "How about nuclear power?"

"OK," said the blonde. "That could be an interesting topic. But let me
ask you a question first. "Horses, cows, and sheep all eat grass. The
same stuff. Yet a sheep excretes little pellets, while a cow turns out a
flat patty, and a horse produces muffins of dried poop. Why do you
suppose that is?"

"Oh god," said the guy. "I have no idea."

"So tell me," said the blonde, "How is it that you feel qualified to
discuss nuclear power when you don't know shit?"