twenty years ago I had a bunch of kids in a school bus throw pens and pencils at me. I hopped the curb, caught up at the light, slowed down and unloaded my water bottle into the open windows. I can still hear their screams.
I haven't had anyone throw anything at me since, but if it happens again, that person will be getting a visit from the police and charges filed. I'm not going to fall to their level and assault them or damage their car. That's beyond childish.