I Want To Kill Someone.
I'm with Mopardude, this stuff pisses me the F off. It really does, I hope to god they get caught.
Here's a little tip you may have already noticed. I am 95% sure that they live in your area, because obviously, they did not have a car (because the hits were made from a sidewalk, and other cars in your neighborhood were hit as well). Just look for trouble makers around the age of 15-17 (strong enough to take on that rock, but not matured yet). A kid younger than that wouldn't have the manpower to throw/swing a rock that big, and seniors are much more responsible and respectful than sophomores, from what i've seen in highschool.