Years ago when I was doing custodial/maintenance for a local school district as I was walking toward the elementary library I heard a loud thud, when I got to the library I found that the interior glass on a large window next to the door to the courtyard had broken into thousands of pieces, most all were still in place, what the issue is that windows near the floor and along side of doors are required to be tempered, pretty much the same as all vehicle windows other than the windshield of vehicles. Tempered glass has unusual aspects to it that can cause it to blow and one of them is fast changes in temperatures, when tempered glass is made, it's my belief that there are certain pressures that end up in the finished product and they show up like someone has thrown something at them. Years ago my wife son and I were visiting her mom in Denver and as we are driving around in the cold weather I turned on the rear window defrost for the second time, to clear the ice built up and in just a few minuted that window exploded in place, our young son was in tears because of the loud sound and I was upset, thinking that someone had thrown a doctored snowball, after I thought it out, I realized it was because I turned on the defrost the second time. I've seen tempered back windows blow out clear back to the mid fifties, seen that happen on more than a few 55' 56' Chevrolets. Perhaps, now days, the making of tempered glass is a lot better, I really haven't seen as much of that happening any more. On a side note, seat belt cutters/window breakers are sold to have in vehicles for emergency, look them up and you will see that the glass breaker is a pointed metal insert in the tool. From time to time I need to get rid of old tempered glass and I needed to do was hit the glass with the pointed edge of a large file and the glass became a large pile of small pieces of easily swept up glass.