I used to drive around with pretty good sized ball bearings and D sized batteries that I would throw out behind me when someone was driving shitty and on my ass. I smashed a dude's windshield on his fancy white BMW. He chased me down and finally cornered me. When I stopped my bike and took of my helmet, he sorta freaked and got back in his car (this was in the 80's and chicks weren't driving crotch rockets much yet).
I also kicked a woman's rear view mirror right off her car in exchange for almost running me over (she was on her cell phone). That was when I sold my bike--a coupla years ago.
Fuck these people and their terrible driving.