the nail

The Nail...

Maggie, a blonde city girl, marries an Aussie dairy farmer. One morning,
on his way out to check on the cows, farmer John says to Maggie, "The
insemination man is coming over to impregnate one of our cows today. I
drove a nail into the 2 by 4 just above the cow's stall in the barn. You
show him where the cow is when he gets here, OK?"
So then the farmer leaves for the fields.
After a while, the artificial insemination man arrives and knocks on the
front door.
Maggie takes him down to the barn. They walk along the row of cows and
when she sees the nail, she tells him, "This is the one...right here."
Terribly impressed by what he seemed to think just might be another
ditzy blonde, the man asks, "Tell me lady, how did you know this is the
cow to be bred?" That's simple. By the nail over its stall", Maggie
explains very confidently.
Then the man asks, "What's the nail for?"
She turns and walks away, and with complete confidence, says, "I guess
it's to hang your trousers on."