salmoor

I have a 2003 Mustang Convertible. I came out Fri. morning to find the rear window completely shattered, held together by the tint film on the window. The car was parked in the garage all night and the rear window was fine when I parked the car at about 4pm. the previous day. Has anybody had a similar situation happen? The overnight temperature fell to about 30 degrees inside the garage. Otherwise, there was no apparent tampering with the car. There was also no evidence that anybody had entered the garage, overnight and nothing appeared to have fallen on the back window. Any ideas?? salmoor