Investigators: Boy, 9, injured after glass shower door shatters

That's pretty much what tempered glass is supposed to do right there.

Yes, there may be a quality control issue in that the tempering might be better or worse depending on the production mechanics and controls, but that view of shattering into multiple small pieces is what's supposed to happen with tempered glass.

Ideally, those pieces would be smaller than some of those we see in the video, but that's way better than what untempered glass would cause - a very few large, heavy, sharp glass pieces falling down on the showerers.

The glass has to go somewhere, folks.

Let's be careful out there.

(Source)