Joke Joke Joke?

A pretty girlis driving though the west. Her car runs out of gas, and an Indain comes along on a horse, and gives her a ride to the gas station. Every few minutes he lets out a wild WHOOP that would curdle milk. Fly, he drops her off with a final YAAAAAAHOOOOO and gallops off. My God says the gas station guy, what the hell were you doing to that Indian to make him holler like that? Why, nothing says the girl, I just sat behind him with my arms around him, holding his saddle horn. Lady says the guy, Indains dont use saddles.