A farmer had 5 female pigs and times were getting tough, so he
 went to the country fair to sell his pigs.

 At the fair, he came across a farmer who had 5 male pigs. After
 talking a bit, they decided to mate the pigs and split everything
 50/50. The two farmers lived 60 miles away from each other so
 they agreed to each drive 30 miles, and find a field to mate their
 pigs.

 The first morning, the farmer with the female pigs got up at 5:00am,
 loaded the pigs into the family station wagon, which was the only
 vehicle he had, and drove the 30 miles.

 While the pigs were going at it, he asked the other farmer, "How
 will I know if they're pregnant?" The other farmer replied, "If they're
 in the grass grazing in the morning, then they're pregnant, if they're
 in the mud, then they're not. The next morning they were rolling in
 the mud so he hosed them down, loaded them again into the family
 station wagon and proceeded to try again. The following morning,
 MUD again! This continued all week until one morning the farmer
 was so tired that he couldn't get out of bed.

 He called to his wife and said, "Honey, look outside and tell me if
 the pigs are in the mud or in the field."

 "Neither one", yelled his wife, "They're in the station wagon and
 one of them is beeping the horn"!