An acorn could def do it. One chattered the windshield in my CTS. Then again, I was moving forward, compounded with the velocity of the acorn, the impact is much more than if it just fell and hit the roof. Were you going under and underpass by any chance on this road? A lot of country roads in Jersey go under bridges and walking paths. Maybe someone flicked something out of their car and it went over the bridge. Or was someone in front of you? Maybe they kicked up a rock and it took just the right bounce and landed on the top glass.

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2011 E70 50i M Sport