The joke of the strongest salesman

It is said that an old farmer sold his own grain for 500 yuan. Shopping, I saw a nice DVD, and the price was 500. Pay for it. When I got home, I found that there was only one DVD player, but I sold the DVD player at a low price and bought a DVD, only to find that the DVD player was gone. I'm so angry that I want to throw away the food. As soon as you see your back, you can see yourself. I nailed the plate to the wall and used it as a mirror. .