http://www.amasci.com/weird/microexp.html
Are you a kid? Does your microwave oven belong to your parents? If so, then don’t even THINK about trying any of these experiments. I’m serious. If I wreck my microwave oven, I can buy another. Also, I’m a professional electrical engineer. I know enough physics and RF effects to take correct safety precautions when I’m experimenting. But you don’t know the precautions, so you should be smart: read and enjoy my writing, but don’t duplicate my tests unless you grow up to become an electronics tech, engineer, etc., and buy your OWN microwave oven.