Ned the Cowboy walks into a bar, and asks for a scotch and soda. The bartender gives it to him, and he finishes it. He goes outside, to leave, and notices that his horse is not there.
So he quiets down the bar, and says, "I'm gonna order another drink. And when I'm done drinkin' it, I'm goin' to go outside. And If my horse is not outside when I'm done with this drink, I'm gonna have to do what I did in Dallas; And I don't wanna do what I did in Dallas!"
So he finishes his drink and goes outside and his horse is there.
As he's riding away, a man from the bar runs after him, and asks him what exactly did he do in Dallas. He says, "I had to walk home"