Rear windshield shattered!

My sister was getting into her car yesterday and as she closed her door her rear windshield shattered out of nowhere. Were trying to figure out how this happened so if you know could you please tell me??

Ask the person who puts the new one in what he thinks is the most common explaination for glass to shatter like this. My speculation ranges from a rifle shot to a metorite to defective glass to the edge of the glass touching the car body. The glass guy would have more experience with this.

We did have a guy incorrectly install the rear glass shock pivot point on a S-Blazer and the glass shattered while open with no one touching the car. This guy used a lock washer under the attachment point for the shock,this put pressure on the glass, you don’t have rear shocks on your glass though.