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My neighbor had some kids throw a large thin plastic Taco Bell cup full of soda at at his windshield as he was driving down the road at about 40 mph and it busted the windshield. Had he been going faster, it might have gone through. Mythbusters did a show on this with a Slurpee and it went through the windshield at higher speed.

Bottom line, if you throw anything with any mass at all at a moving vehicle, it has the potential to penetrate the glass and is very dangerous. I don't disagree with the charges that were assessed against the individuals and the level of severity the laws have established. Personally, I think the guy who drew his gun was justified due to the potential of items thrown from a vehicle causing serious injury.

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