I know the saying and they taught me it and then spanked it into my behind. When I park in no mans land and then still come out and find an 83 caprice parked next to me and a nice dent in my door as a reminder I lose my memory really quick. 2 cars at the very end of a lot and one of them smashes his door into the other one is not a simple mistake, it is someone bitter that they don't drive such a beautiful car and intentionally scarring it.
I admit being childish and having a bad temper in these situations but I don't let these go unnoticed.
You are right though, cube - it probably doesn't teach the other guy a lesson, it just makes them mad too - perhaps I will have to be more creative in my retribution