A neighbor of mine actually had a disc explode in his drive.
I couldn't believe it at first, but sure enough, the drive sounded like a maraca when I shook it.
My Diablo II disk shattered in my mothers PC when I was in the 7th grade, we were both rather upset (me because I lost my game disc in the era they were still used for anti-piracy, her because she needed to buy a new CD drive).
http://blog.cdrom2go.com/2011/02/can-a-cd-rom-disc-explode-i...
You can do it, but it takes some effort. CDs don't typically suffer structural failure at normal operation speeds...