A stranger was seated next to a little girl on the airplane. The stranger turned to the little girl and said, "let's talk. I have heard that flights go faster if you strike up a conversation with your fellow passengers."
The little girl, who had just opened her book, closed it slowly and said to the stranger, "What do you want to talk about?"
"Oh, I don't know," said the stranger. "How about nuclear power?" and he smiles.
"OK," she said. "That could be an interesting topic."
But let me ask you a question first," she said.
"A horse, a cow, and a deer all eat the same stuff, grass. Yet, a dear excretes little pellets, a cow excretes flat patties, and a horse produces clumps of dried grass. Why do yo suppose that is?"
The stranger visibly surprised by the little girl's intelligence, thinks about it for a moment and says, "hmmmm, I have no idea!"
To which the little girl replies, "do you really feel qualified to discuss nuclear power when you clearly do not know shit?"