This is a stupid question I know. However going to throw it out here anyway. How strong is the Iphone glass. I know its Gorilla 2 glass from my understanding. However what force would it normally take for the glass to be pressed hard in order for any damage to incur internally. Not that I am wanting to do this. But just asking, as a general thought. I mean I guess Apple goes through its toughest QC, tests, when it comes to pressure, for example if someone has the phone in there back jean pocket and sits on it, or if someone presses into the glass etc. Is it possible to have internal damage behind the glass that is not visually seen or heard? Any ideas?