On the way home, I was waiting in a long line of traffic. Suddenly the SUV ahead of me decides to back up...she kept coming and it was inevitable. So I unclipped and punched her back bumper with front wheel.

Nothing! She switched lanes and tried to take off but got stuck in the other laine. In her rear view mirror, she must have seen the LARGE YELLOW FLASHING STROBE So she rolled down her window and asked if I was OK. I didn't mention the new scratch on her bumper...just growled and said to watch while backing.

I hit her first and it felt good. Next time, I'll actually have to dismount and throw the bike instead.
Vehicular Geek Fact: Lane position - far left