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. So they 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.,
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 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 family station wagon again and proceeded to
try again. This continued each morning for more than a week.
One morning the farmer was so tired, he couldn't 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 and one of
them is honking the horn."
