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 4 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 family station wagon again and
proceeded to try again.
This continued each morning for more than a week. The next
morning he 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 and one
of them is honking the horn.'