An Indian walks into a diner in a town next to the reservation in Oklahoma with a shotgun in one hand and pulling a male buffalo with the other. He says to the counterman, "Want coffee."
The counterman says, "Sure, Chief, coming right up." He gets the Indian a big mug of coffee.
The Indian drinks the coffee down in one gulp, turns and blasts the buffalo with the shotgun, causing parts of the animal to splatter everywhere, then just walks out.
The next morning the Indian returns. He has his shotgun in one hand and is pulling another male buffalo with the other. He walks up to the counter and says, "Want coffee."
The counterman says, "Whoa, Tonto! We're still cleaning up your mess from yesterday. What was all that about, anyway?"
The Indian smiles and proudly says, "Training for position in United States Congress: Come in, drink coffee, shoot the bull, leave mess for others to clean up, disappear for rest of day."