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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