Nancy, a city girl, married a farmer.
One morning, before the farmer went out to the field, he said, "Honey, the artificial insemination man is coming over this morning to impregnate one of the cows. I put a nail in a two-by-four over the stall. Please show him where it is."

When the man arrived, Nancy led him down the row of stalls until she saw the nail. She pointed to the stall and the man remarked, "Are you sure?"

"Yep, it's the one with the nail," said Nancy.

"What's the nail for?" inquired the man.

"Well, I guess it's there to hang your pants on."