A traveling salesman's car breaks down in the middle of nowhere.
So he goes looking for help, and eventually finds a lone farmhouse. Spying a light, he goes up to the door and knocks.
"Hi. My car broke down a while back. Got a phone I can use to call for help?" he asks the farmer when he opens the door.
"Nope," he's told. "I ain't got no phone here. But if you want, I can give you a ride into town in the morning to get some help."
The salesman agrees, and the farmer shows him to his room.
"What's that?" he asks, spying a wall of eggs.
"My daughter, the most beautiful creature in the world, is behind that wall," the farmer explains. "Now, come morning, if any of them eggs are broke, I'm gonna kill you. Understand?"
The salesman agrees to this, and turns in to bed. Later that night, though, he hears the daughter moaning from behind her wall, and finally he can't control himself anymore. He has to see this beauty. Rushing through the wall, he finds that she's even more beautiful than her father said, and she's quite ready to have fun. They spend the whole night making wild passionate love.
The salesman is woken by the rooster in the morning, and he hears the farmer climbing the stairs. In a panic, he grabs a jar of glue and starts gluing the eggshells back together. He has just finished putting the last egg into the wall when the farmer bursts into the room.
"So, you managed to control yourself," the old man says, looking at the intact wall. "Come on down, and I'll make you breakfast."
So saying, he grabs a couple of eggs from the wall. The salesman is petrified as he sits at the breakfast table. He knows that the eggs the farmer picked are empty, and he knows the farmer will catch on to what happened.
The farmer cracks open an egg.
Nothing.
He cracks open a second egg.
Again, nothing.
He cracks a third egg.
Nothing.
"Hmm," he says, looking right at the salesman, a frown appearing on his face. "The damn rooster's been using rubbers again!"