A congressman was seated in first class next to a little girl on an airplane. He turned to her and said, "Do you want to talk? Flights go quicker if you strike up a conversation with your fellow passenger."
"OK," she said. "Those could be interesting topics but let me ask you a question first. A horse, a cow and a deer all eat the same stuff - grass. Yet a deer excretes little pellets, while a cow turns out a flat patty but a horse produces clumps. Why do you suppose that is?"
The legislator, visibly surprised by the little girl's intelligence, thinks about it and says, "Hmmm, I have no idea."
To which the little girl replies, "Do you really feel qualified to discuss global warming, universal health care or the economy when you don't know crap?" Then she went back to reading her book.