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There was a time in the US, back in the late 1990s, when a now nearly-defunct dialup Internet service provider called "America Online" shipped free setup CDs out as junk mail to every address they could find on the continent.

People found novel uses for the CDs:

http://www.youtube.com/watch?v=uADnSZszD-s

My favorite, which I can no longer find online, was a solar cooker that focused sunlight using the shiny sides of several hundred old AOL CDs and could be used to fry sausages, melt metal for recycling, fire pottery, or inscribe one's initials on the surface of the Moon. It was less of a "solar cooker" and more of a "death ray," come to think of it.