In-Flight Conversation

A guy gets on a plane and finds himself seated next to a cute blonde.
He immediately turns to her and makes his move.

"You know," he says, "I've heard that flights will go quicker if you
strike up a conversation with your fellow passenger. So let's talk."

The blonde, who had just opened her book, closes it slowly and asks
the guy, "What would you like to discuss?"

"Oh, I don't know," says the guy. "How about nuclear power?"

"OK," says the blonde. "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 the deer excretes little pellets, the cow turns out
a flat patty, and the horse produces muffins of dried poop. Why do you
suppose that is?"

The guy is dumbfounded. Finally he replies, "I haven't the slightest
idea."

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