A farmer buys several pigs, hoping to breed them for ham and bacon. After several weeks, he notices that none of the pigs are getting pregnant, and calls a vet for help. The vet tells the farmer that he should try artificial insemination.
The farmer doesn't have the slightest idea what this means but, not wanting to display his ignorance, he only asks the vet how he will know when the pigs are pregnant. The vet tells him that when pregnant, they will stop standing around and will, instead, lay down and wallow in the mud. The farmer hangs up and gives it some thought. He comes to the conclusion that artificial insemination means he has to impregnate the pigs.
So, he loads the pigs into his truck, drives them out into the woods, has sex with them all, brings them back and goes to bed. Next morning, he wakes and looks out at the pigs. Seeing that they are all still standing around, he concludes that the first try didn't take, and loads them in the truck again. He drives them out to the woods, banged each pig twice for good measure, brings them back and goes to bed.
Next morning, he wakes to find the pigs still standing around. One more try, he tells himself, and proceeds to load them up and drive them out to the woods. He spends all day shagging the pigs, and, upon returning home, falls listlessly into bed.
The next morning, he was woken up by his wife shaking him and saying "Wake up Dear, the pigs are acting strangely!". "What do you mean?" he asked excitedly, "Are they wallowing in the mud?" "No, " she says, "they're all in the truck and one of them is honking the horn."