Joke. The Blind Man

A blind man walk's into a bar. He orders a drink and says to the barmaid, "do you want to hear a joke about blondes ?"
Silence falls and the woman next to him says "Before you say anything, the girl behind the bar is a blonde, the girl at the door is blonde, I'm a six foot, sixteen stone blonde karate black belt and my friend here is a blonde wrestler. Do you still want to tell your joke.
" Nah the blind guy says. Not if I have to explain it four times!"