A man is driving down the road and notices a car in the ditch. He doesn't usually help many people so he drives on by. Then he notices that a pretty woman is the driver so he goes back to help.
As he is hooking his truck to her car he says, “You know, you are the first pregnant woman I've ever helped out of a ditch.”

“But I'm not pregnant,” she says.

“Well, you're not out of the ditch yet,” he says.