A Canterbury farmer on the South Island in New Zealand buys several sheep, hoping to breed them for wool. After several weeks, he notices that none of the sheep are getting pregnant and phones a vet for help.
The vet tells him that he should try artificial insemination.
The farmer doesn't have the slightest idea what this means but, not wanting to display his ignorance, only asks the vet how he will know when the sheep are pregnant.
The vet tells him that they will stop standing around and instead will lie down and wallow in grass when they are pregnant.
The man hangs up and gives it some thought. He comes to the conclusion that artificial insemination means he has to impregnate the sheep himself. So he loads the sheep into his Land Rover, drives them out into the woods, has sex with all, brings them back and goes to bed.
Next morning he wakes to find the sheep still just standing around. "Try again" he tells himself and proceeds to load them up and drive them into the woods. He spends all day banging the sheep and upon return home, falls listlessly into bed.
The next morning he cannot even raise himself from the bed to look out of the window. He asks his wife to have a look and tell him if the sheep are lying in the grass.
"No", she says, "they're all in the Land Rover and one of them is beeping the horn"!