The Nail

Amy, a blonde city girl, marries a Colorado rancher.
One morning, on his way out to check on the cows, the rancher says to
Amy, "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. Yo u show him where the cow is when he gets here, OK?" So then
the rancher leaves for the fields.

After a while, the artificial insemination man arrives and knocks on
the front door. Amy 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." Amy 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 pants on."