A stranger was seated next to a little girl on the airplane when the stranger turned to her and said: "Let's talk, I am sure that flights are faster if you strike up a conversation with your fellow passenger."
The little girl who had just opened her book, closed it slowly and asked the stranger, "What would you like to talk about?"
"Oh, I don't know", said the stranger.
"How about nuclear power?" The girl asked.
"Ok," he said "That could be an interesting topic!"
The girl continues: "But let me ask you a question first. A horse, a cow and a deer all eat grass, the same stuff. 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 stranger thinks about it and says:"Hmmm, I have no idea."
To which the little girl replies:"Do you really feel qualified to discuss nuclear power when you don't know shit?"