Friend of mine at work complained on her Facebook that her "stupid iPhone" screen broke. She just got the 4S maybe 3 weeks or so ago. Verizon wouldn't replace it even though she had insurance on it and ended up paying the $160 fee or whatever. Anyway it's cracked at the bottom right and she says she woke up and the screen was cracked. I've never heard of glass randomly cracking unless under certain conditions (really cold and then hot, etc...). I don't think she's lying, I told her I'm not the Apple Police but she swears she woke up to it broken. I'm guessing she karate chopped it while she was sleeping somehow.