A door-to-door salesmen knocks on a neighborhood door. A little boy answers the door and the salesman says,
"Hi little fellow, is your mother home?"
"Yes," said the lad,
"she's out in the backyard screwing our goat."
"No," says the salesman, "I don't believe you."
The boy says, "Come see for yourself."
So the salesman takes a look in the backyard, and sure enough, there was the mom bent over with a large goat screwing her from behind. The salesman said to the boy,
"Isn't your mom afraid she'll get pregnant?"
The boy says, "N-a-a-a-a-a-"
