A man was reading the paper when an ad caught his eye: 500 BMW! New! The man thought that it was very unusual to sell a BMW for 500, and he thought it might be a joke, but thought it was worth a shot. So he went to the lady's house and sure enough, she had an almost brand new BMW.
"Wow!" the man said. "Can I take it for a test drive?" Unlike what he expected, the man found that the car ran perfectly and took it back to the lady's house.
"Why are you selling me this great BMW for only 500?"
"My husband just ran off with his secretary, and he told me I could have the house and the furniture as long as I sold his BMW and sent him the money."