4 Dangerous Experiments With Microwave, Item 3 / 4
Warning: you could seriously hurt, and microwave is likely to be damaged. To reduce the risk, be sure to use gloves and keep the microwave on not more than 45 seconds.
This way you not only get rid of the data on the disk, but also can create a home lightning. Insert the CD into microwave with the shiny side up and turn on maximum power. You will see small flashes that destroy the disk.