My tech got one like that driving past a golf ball driving range. Perfect circles.
When they come to replace your windshield check the edges. Mind had a burr that caused mine to crack. A UPS truck def threw a rock, but the burr was what split my windshield in half. Sounded like a gunshot.
I took pics and ground the burr down and covered with touch up paint.
GM didn't give a crap. $0 ded in fl so I didn't care.
I've had a crack that looked very similar to that from what I assume was a rock from a large dump truck going past me in the opposite direction. I seem to be a real rock magnet, I've had to replace the windshields in the past 3 vehicles from rock impacts. I only made it two weeks in my new 2012 Volt before cracking the windshield, but I was able to have that one repaired.
I've never seen one with circular cracks before. Mine have all had the spider web pattern and have been from rocks while driving. The golf ball suggestion above is probably right, or maybe something similar like a baseball. It could have come almost straight down or bounced off the house. Makes one wish there were a security camera running.
I've seen this a few times
1) I live by a golf course... 'nuff said
2) My friend has a HUGE black walnut at the end of his lawn that drops some killer nuts and has dented several cars and broken windows like that before.
The fellow from Safelite AutoGlass agrees that it was an impact, but I don't know from what.
A golf ball is a real possibility, but I just can't visualize a parabola that ends in a vertical drop. If the golf ball hit the roof and rolled, it would have fallen only half a story and really hit hard. Also, the golfer had to retrieve the ball almost immediately without my wife seeing him after the popping sound.
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