> >
  >   >
  >   > Lena, a city girl, marries a farmer. One morning, before he goes
  > out to
  >   the
  >   > fields, the farmer says to her, "The artificial insemination 
man
  > is coming
  >   to
  >   > impregnate one of our cows today. I drove a nail into the
  > two-by-four
  >   above
  >   > the cow's stall. You show him where it is, okay?"
  >   >
  >   >
  >   > So the farmer leaves for the fields, and a while later, the
  > artificial
  >   > insemination man arrives.Lena takes him down the long row of 
cows
  > until
  >   she
  >   > sees the nail, and tells him, "This is the one. This one 
right
  >   > here!"
  >   >
  >   > Terribly impressed, the man asks, "How did you know this is 
the
  > cow to be
  >   > bred?"
  >   >
  >   > "By the nail over it's stall," Lena explains.
  >   >
  >   > Then the man asks, "What's the nail for?"
  >   >
  >   > "I guess it's to hang your pants on," she tells him as 
she walks
  > away.
  >   >