This brought back a memory. A couple of years ago, I was cleaning out a lower cupboard. My cookware and storage containers were in it. I was taking everything out so I could clean out the cupboard and organize what had gotten messy. I had three nested Pyrex casserole dishes and because they were glass, was taking them out one by one. When I took out the second one, my hand was about 3 inches from the floor when I fumbled and dropped it. It shouldn't have broken at all, but it broke apart into a bunch of large pieces (and of course some small ones).
I remember being so surprised. It just wasn't far enough above the floor to even crack, let alone break apart like that. I remember thinking that it broke so readily. It seemed so odd at the time. Now I wonder if maybe it didn't have microfractures in it already, and maybe dropping it saved me from having it explode on me.