A blind man enters a bar, carefully, and finds his way to a barstool.
After ordering a drink, and sitting there for a while, the blind guy yells to the bartender, “Hey, you wanna hear a blonde joke?”
The bar immediately becomes very, very quiet.
In a husky, deep voice, the woman next to him says, “Before you tell that joke, you should know something. The bartender is blonde, the bouncer is blonde, and I’m a 6′ tall, 200 pound blonde with a black belt in karate. What’s more, the fella sitting next to me is blond, and he’s a weightlifter. The woman to your right is a blonde, and she’s a pro wrestler. Think about it seriously, mister. You still wanna tell that blonde joke?”
“Nah," says the blind guy, "not if I’m gonna have to explain it five times.”
It was a dark winter night, and among the usual queue of studded leather, chained piercings and rubber appendages, the S&M club's bouncer was surprised to see a man in an expensive suit and tie standing patiently, a calculator in one hand.
"Sir, are you lost?" asked the doorman.
"Oh, I'm the statistician." came the reply.
"Then, what are you here for?"
With an unsettling grin, the statistician pulls out a knife.
"Oh, just standard deviation."