Inspired by the “jokes you’ve heard lately” thread, this spontaneously came to me- but without an ending! It’ll be obvious what general sort of ending it must have, but I couldn’t come up with a real zinger:
"A traveling salesman stopped at a remote farmstead late one evening hoping to be put up for the night. The elderly farmer who lived there agreed, but said that because he snored so loud the salesman would have to stay in his daughter’s room.
At first the salesman was puzzled why a man would let a stranger stay overnight in his daughter’s bedroom, but the mystery was solved when he saw her. She wasn’t just plain, she wasn’t even homely, she was repulsively ugly, the kind of woman you could only have sex with if she had a bag over her head. So the salesman lay down on his half of the bed and went to sleep.
Later that night the salesman was awakened. It was pitch black, he couldn’t see a thing; but he was laying on his back with an achingly stiff erection, and someone making sighs and moans was riding him for all they were worth. It felt great, so the salesman said to himself “Oh well, all cats are gray in the dark” and just lay there and enjoyed it.
The next morning…