Windshield seems very easily damaged by even the most minor impacts with even the smallest chip spreading very quickly.
I was driving and entering the freeway when my car made a loud exploding pop. there were no cars next to me as i was entering the on-ramp. there were no overhead bridges or trees. nothing fell from the sky. i stopped the car and found the sunroof shattered with a large hole. there was no debris inside other than glass. i believe that there is a defect with the sunroof that caused it to shatter. it should not have shattered this much with just normal use. this occurred about 5 minutes after leaving my indoor garage so the car/sunroof was not overheated. if the inner cover was open at the time, the glass would have shattered into the car and caused a serious accident. i have seen multiple reports of this same thing happening and this needs to be addressed with the manufacturers before someone is hurt or killed.