Honk! Honk!
A farmer had five 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 five male pigs. After talking a bit, they decided to mate the pigs and split everything 50/50.
The farmers lived sixty miles apart and agreed to drive thirty miles each and find a field in which to let the pigs mate.
The first morning, the farmer with the female pigs got up at 5 a.m., and loaded his 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 are lying in the grass in the morning, they're pregnant. If they are 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 family station wagon
again, and drove the thirty miles to meet with the other pigs in the field so they could mate again. This continued each morning for more than a week.
The next morning, the farmer was too tired to get out of bed. He called to his wife,
"Honey, please look outside and tell me whether the pigs are in the mud or in the grass."
"Neither" yelled his wife, "they're in the station wagon, honking the horn!"