The owners left for work and there was nobody home, so they decided to take their clothes off.
They worked Without Clothes for a few hours, when they heard the door-bell.
"Who is it?", one of the asked.
"It's a blind-man", answered the man from outside. Since they realized he couldn't see them anyway, they decided to stay the way they were.
They opened the door, and the man said: "Hey, nice body! where do you want the blinds?"...