I managed to explode a 9x13 by placing the cooled dish on the stovetop to free up counter space. This wasn't initially a problem, the problem came when I turned on what I thought was the front burner to start cooking, but was actually the burner the 9x13 was straddling. The explosion was interesting, it didn't make a "bang" but rather a "pop" sound and the shattered glass flew all over the kitchen. It probably would have been worse, but the 9x13 was full of brownie that probably absorbed some of the kinetic energy.

It makes me wonder how glass cooktops avoid this problem. They have enormous uneven heating stresses every time they are used, and somehow manage to avoid flying apart.