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Maggie, a blonde city girl, marries an Australian 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 4 by 2 just above the cow's stall in the barn.
You show him where the cow is when he gets here,
OK?"
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 thought just might be another dizzy 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."