Years ago when we cleaned up our office we found stacks and stacks of old software CDs, as tend to build up after years in the computer business. So for a while we had fun tossing one up and whacking it with a baseball bat. Great fun, however cleaning up the floor afterwards was a bit of a chore. Pieces were found in various corners for months.
When struck with force, a CD will shatter into tons of small fragments of acrylic plastic.