Here's one of my old ones that for some reason I have a picture of:
Image
You can see how it had chipped along the edges. Some of the cracks were from the phone falling, some were from the stress of prying the screen shield off of the phone to replace it.
I rarely ever drop my phone. In this particular instance I was dressed in business attire because I had made a presentation for a class earlier in the day. The pants I was wearing had very shallow pockets, and the phone was too tall to fit in my pockets without sticking out to some extent. When I got back to my suite in my dorm, I went to the bathroom with my phone still in the pocket (which I almost never do).. and yeah. It fell out onto the tile floor face down. The cracks at the top and the small ones on the very bottom left corner happened from that impact. All the ones in the middle (including the long vertical one) occurred while I was peeling it off. There was no use in being careful because it was already cracked, and the silicone adhesive keeps all the glass together so it wasn't like I would have shards of glass flying in my face while I was removing it.
My phone's screen was perfectly fine.