An eighteen year-old boy came home with a Porsche and his parents asked
"Where did you get that car?"
He calmly told them, "I bought it today."
"With what money?" demanded his parents.
We know what a Porsche costs."
"Well," said the boy, "this one cost me fifteen pounds."
So the parents wondered. "Who would sell a car like that for fifteen pounds?"
"It was the lady up the street," said the boy. Don't know her name, they just moved in. She saw me ride past on my bike and asked me if I wanted to buy a Porsche for fifteen pounds."
"Oh my Goodness!," moaned the mother, "she must be after something. Who knows what she will do next? John, you go right up there and see what's going on."
So the boy's father walked up the street to the house where the lady lived and found her out in the garden calmly planting petunias.
He introduced himself as the father of the boy to whom she had sold a Porsche for fifteen pounds and demanded to know why she did it.
"Well," she said, "this morning I got a phone call from my husband. I thought he was on a business trip, but learned from a friend he has run off to Hawaii with his secretary and really doesn't intend to come back. He claimed he was stranded and asked me to sell his new Porsche and send him the money. So I did."
I seem to recall this happening in real life, a woman found out her husband was having an affair and kicked him out, leaving I think, a newish Mercedes behind,. After a few weeks she asked her ex what he was going to do with the car and he said to "sell it for what she could get". So she advertised it in the local paper for £100, when a punter arrived she insisted on him paying the £100 without seeing the car first, which he did and he got the bargain of a lifetime.