I don't know if this is an old one, but I just heard it. My apologies to all blondes - I don't make 'em up, I just relay them.

A blind cowboy wanders into an all-girl biker bar by mistake. He finally finds his way to a stool and orders a cup of coffee.

He sips his coffee for a minute or two then hollers, "Hey, anybody wanna hear a blonde joke?"

The bar falls quiet but then in a husky voice, the woman next to him says, "Before you tell that joke, Cowboy, I think it is only fair, given that you are blind, that you should know something. The bartender is a blonde girl with a baseball bat and the bouncer is a blonde girl. Not only that, but I'm a 6-foot, 165-pound blonde woman with a black belt in karate and the woman sitting on the other side of you is blonde and a professional weightlifter. The lady sitting at the table right behind you is a blonde and she drives truck. Now, think about it. Do you really want to tell that joke?"

The blind cowboy thinks for a second, shakes his head, and mutters, 'Well, no...
not if I'm gonna have to explain it five times.'