When I was a kid we used to put rocks in the middle of the snowball. Dumb stuff.
When I was 12, a friend and I were hitting cars with snowballs from atop a garage near an intersection.
Not knowing the driver, one car we hit was the town tough-guy and brawler. Had been to jail for assault, etc... The guy chased us for 45 minutes, in and out of yards, screeching his tires down streets, etc... I felt like I was in the movie Terminator.