A traveling salesman is drving through the countryside en route to his next sale. His car starts giving him trouble, so he pulls it over to the side of the road. After popping the hood, he deems the car inoperable and decides to fix it in the morning, as dusk has already fallen. He surveys his surroundings and sees a small house with a farm about a half-mile up the road.
When he gets to the house, he sees a truck in the driveway, and the front porch light is on. "Good," he says aloud to no one but himself, "Someone is home." He knocks on the door. Nothing. He knocks a little louder. Finally, an old, rugged-looking farmer answers the door.
"Can I help you?" asks the farmer.
"I hope so," says the salesman. "My car broke down and I won't be able to get it fixed until the morning. Do you have an extra room I can sleep in tonight?"
The farmer looks the salesman up and down and gives him a slight, approving nod.
"Yes, we do," says the farmer. "But you better not sleep with my son."
"Woah!" says the salesman. "I think I'm in the wrong joke!"