A Vaseline salesman is driving through the country, when his car starts leaking and loses all its oil. Not knowing what to do, he fills the engine with Vaseline, thinking that it is similar to oil, and drives away. It works fine until about half an hour later, when the engine gets real warm, and the Vaseline melts, and runs out through the same hole as the oil did. This time there is a farm nearby, so he decides to look for a phone.
Meanwhile, inside the farmhouse, the farmer, his wife, and daughter are having a fight about who's going to do the dishes. "I did them this morning," complains the farmer. "Well I did them at lunch," says his wife. "And I'm tired from doing all the farmwork," says the daughter. So the farmer, in a stroke of brilliance, decides that they will settle it by all taking off their clothes, lying on the floor, and declaring that the first one to speak gets to do the dishes.
The Vaseline saleman gets to the front door, and rings the bell. No one answers so he goes in and looks for a phone. He eventually stumbles into the kitchen, and ignoring the odd sight, asks for a phone. No one answers, so he goes and looks some more. Still no luck, so he goes back to the kitchen. They still won't answer, so he decides to see what else he can get away with. He has sex with the daughter several times, bemused by her silence, then finally goes and looks for the phone again. A while later, he comes back, looks at the wife, and says, "Why not?" After having sex with the farmer's wife, he is getting tired and exasperated. He thinks, maybe if they have some Vaseline, I can drive my car for another half-hour. So he asks, "Do you have any Vaseline?" at which the farmer jumps up and yells, "I'll do the dishes!"