A blind man and his guide dog enter a bar and find their way to a barstool. After ordering a drink, and sitting there for a while, the blind guy asks the barman whether he wants to hear a blonde joke.
The bar immediately becomes absolutely quiet.
In a deep, husky voice, the woman next to the blind man says,
"Before you tell that joke, you should know something. The barman is blonde, the bouncer is blonde and I'm a six foot tall 200lb blonde with a black belt in karate. What's more the woman sitting next to me is blonde and she's a weightlifter; the lady to your right is blonde, and she's a pro wrestler.
Think about it seriously, mister.
Do you wanna tell that blonde joke?"
The blind guy says,
"Nah, not if I'm gonna have to explain it five times."
Inside Back, Business and Finance, 11.1.01