A Pakistani farmer migrates to USA. He comes to know that cattle farming is big business. So he buys several cows, hoping to breed them for milk, cheese, beef, etc. After several weeks, he notices that none of the cows are getting pregnant and calls the vet for help.
The vet tells the Pakistani farmer that he should try artificial insemination. The Pakistani 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 cows are pregnant. The vet tells him that they will stop standing around and will, instead, lay down and wallow in the mud when they are pregnant. The Pakistani hangs up and gives it some thought. He comes to the conclusion that artificial insemination means he has to impregnate the cows. So, he loads the cows into his truck, drives them out into the woods, has sex with them all, brings them back and goes to bed. Next morning, the Pakistani wakes and looks out at the cows. Seeing that they are all still standing around, he concludes that the first try didn't take effect, and loads them into the truck again. He drives them out to the woods, has sex twice with each cow for good measure, brings them back and goes to bed.
The next morning, the Pakistani cannot even raise himself from the bed to look at the cows. He asks his wife to look out and tell him if the cows are laying in the mud.
"No," she says, "they are all in the truck and one of them is honking the horn.