Tried busting a CD today. Put it in a t-shirt and smashed it with the butt of my knife. I ended up with one big crack down the middle, then hit it again and again.
Eventually, I got large breaks in the CD case, that sorta fanned out... like a shocked wavce effect through the ground (in a fan shape).
So I cracked off 3 big chunks, and then manually broke off tineir pieces... needless to say, some of the cohesion of the pieces was lost, as it becomes a mini jigsaw puzzle everytime I accidently screwed something up. I\'ll prime and take a pic sometime to see if I can save it...
Perhaps making a sheet of GS and just cutting it with a knife is easier...