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 says to
the
guy, "What would you like to discuss?"

"Oh, I don't know," says the guy, smiling. "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 s - - t ?"