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,  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 lying in the grass  tomorrow 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 once more.  This continued each morning for more than a week and both farmers were worn  out.

 

The next  morning he overslept and 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 all in the station wagon and one of them  is honking the horn".

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