So, I buy an old car that's done a hundred and fifty thousand miles, and get it cheap. Then I ask myself, How can I chage the clock so that it reads ten thousand? If I run the car backwards, the numbers will go backwards. But who's going to drive a car backward for thousands and thousands of miles? Nobody, young Michael said. Right, said his father. Now this clock thing runs off one of the front wheels. So I use an electric drill on it, and when the drill turns, it turns the clock backwards - very fast! I can take fifty thousand miles off the car in a few minutes! And by the time I finish, the car's only done ten thousand, and I tell the customer, It belonged to an old person who only used it once a week for shopping. He laughed loudly.