Many a time has this clear crystalline panel been bumped, etc, and remained whole. Many a time. So when I bumped it tonight and there was a tremendous cracking sound and suddenly a quarter of my room was covered in glass remnants...I was just a tad bit surprised. What a way to end a night. :) I broke out the broom, got as much of the extra shardlings back to the mass, used my hands and a brush to get some of the stuff that had fallen into the center panel...and decided the rest could wait, cause god damn is glass dust abrasive. I don't own any good rubber gloves and since I don't have a vacuum cleaner...(guess what I'm going to be borrowing). It was actually pretty impressive - the big shards were shot through with shatter marks, and would crumble in my hands into their small bits if I put pressure on them. And it was making this crackling noise that I can only describe as snow-like as it sat there, slowing shifting or whatnot.
Anyways, my allegory is this. As simple and clean and transparent as a pane of glass can be, a single moment of inattentiveness can destroy it all, leaving it a ruin. :P