A travelling salesman has his car break down late one night and so he walkes a few miles down the road until he finds a old farmhouse. He goes up knocks on the door and the old farmer answers.
"Sir, my car broke down a few miles up the road," he begins, "would it be possible for me to stay here tonight and call for a tow truck in the morning?"
"Certainly," answers the old farmer, "but you will have to share a room with my son."
"Your son?" says the salesman shocked, "I'm sorry. I must be in the wrong joke."