A farmer had four female pigs. Times were hard, so he decided to take them to the county fair and sell them. At the fair, he met another Farmer who owned four male pigs. After talking a bit, they decided to mate the pigs and split everything 50/50.
The farmers lived sixty miles apart. So they agreed to drive thirty miles each to a field in which the pigs could mate. The first morning, the farmer with the female pigs got up at 5 A.M., loaded the pigs into the family station wagon, which was the only vehicle he had, and drove the thirty miles.
While the pigs were mating, he asked the other farmer, "How will I know if they are pregnant?" The other farmer replied, "If they're lying in the grass in the morning, they're pregnant. If they're in the mud, they're not."
The next morning the pigs were rolling in the mud. So he hosed them off, loaded them into the Station wagon again and proceeded to try again. This continued each morning for more than a week and the farmers were about worn out.
About two weeks later the farmer with the female pigs was too tired to get out of bed. He said to his wife, "Honey, please go look outside and tell me whether the pigs are in the mud or in the grass."
"Neither," replied his wife...."they're all in the station wagon...and one of them is honking the horn.”
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