Blind man sits down in a bar and is having a conversation with the bartender.
"Would you like to hear a blonde joke," he asks.
"Hold on," says the bartender. "You should know, I am blonde. The bar owner is blonde and so is the piano player and the bouncer. In fact, the person sitting next to you is a lady wrestler and blonde too! Now, do you really want to tell that joke?"
The blind man thinks for a moment and then shakes his head. "No, I wouldn't want to have to explain it 5 times!"