Robert Fulgham Joke

A beat up old cowboy went in to a bar and sat down by a cute chick.
She looked at him and asked if he was a real cowboy.
He said yes, he'd spent his whole life thinking about nothing but cows and horses.
"Well," she said. "I'm a real lesbian- I don't think of anything but women."
Another man came in and sat down by the cowboy and asked, "Are you a real cowboy?"
The cowboy said, "I always thought so, but I just found out I'm a lesbian."