(Sorry to do this but your topic brought out all the rage whenever I see this happen)
I was at hyper star the other day trying to park my car I saw a family getting into their car so I pulled up behind them and began indicating and waited for the car to leave. As the car started to back out another car saw the spot and tried to position it's self to take the parking I got out and said I'm waiting for the spot plz do you mind backing up, the guy said sure sure and when I got into my car I discovered he had taken the parking spot. I was furious I went to his car and said I was waiting he said soo, and we proceeded to have an argument (note the man was educated not a random driver). In any case we quarrelled I was furious he left his car I. The spot and went away to do shopping our whatever. I being lucky enough to have an ironman bumper on my jeep decided why not teach some people a lesson. I turned my car around and nudged the back of his corolla the result was two broken tail lights a broken bumper and bent trunk, while the front sustained less damage as i didn't push hard enough only scratched the bumper (rubbed against the wall). I then proceeded to exit the car parking.
I know this is now advisable but some people just don't learn any other way.