Doubt the "stand your ground law" for shooting this biotch would hold in court 
About all I can do is hold both hand up in the universal "WTF" guesture, and avoid/go my own way. When I see the window go down in the vehicle in front of me, I back off and wait for whatever's coming (usually a cigarette butt, but you never know). Also my personal fav is when someone hits their windshield washer, either deliberately or just oblivious to washing me also).

About all I can do is hold both hand up in the universal "WTF" guesture, and avoid/go my own way. When I see the window go down in the vehicle in front of me, I back off and wait for whatever's coming (usually a cigarette butt, but you never know). Also my personal fav is when someone hits their windshield washer, either deliberately or just oblivious to washing me also).