They headed down to woooh old El Paso
That's where they ran into a great big asshole

The story:

I was singing it out loud at a party and people
laughed when I used the line. Since I had
always thought it was a pretty funny line
anyway, I figured they were just laughing
because they were all high. Afterward,
someone mentioned that it was "hassle", not
the other word. I still sing it my way.