The blonde and the cow

A blond city girl named Amy recently married an Alberta rancher.
One morning, on his way out to check on some distant cattle, the rancher says to Amy, 'The insemination man is coming over to impregnate one of our cows today, so I drove a nail into the 2 by 4 just above where the cow's stall is in the barn. Please show him where the cow is when he gets here, OK?'
The rancher saddles up and heads out.
After a while, the artificial insemination man arrives at the homestead.
Amy takes him down to the barn. They walk along the row of cows and when Amy sees the nail, she tells him, 'This is the one right here.'
The man, assuming he is dealing with an airhead blonde, asks, 'Tell me lady, 'cause I'm dying to know; how would YOU know that this is the right cow ?'
'That's simple," she said. "By the nail that's over its stall,' she explains very confidently.
Laughing rudely at her, the man says, 'And what, pray tell, is the nail for?'
The blonde turns to walk away and says sweetly over her shoulder,

'I guess it's to hang your pants on.'

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