ive never been in a situation where ive done anything to warrant leaving a note, but id like to believe i would, for the same reasons many have said - because if it were the other way around id be pissed and as someone said already- "karma is a bitch".
i have however been sitting in my old car (vn calais) once waiting for a mate to get back from dropping a video into the shop and a asshole opened his door really badly onto my back passenger side while getting his kid out.
i deliberately stayed in the car for a sec to see what he would do.
he looked at HIS door to check for damage, did the typical "rub your hand over it", like that fixes it or something, lol...and then walked off with his kid.
so i jumped out (he obviously didnt realise i was sitting in the car) and asked him where he thought he was going.
he acted all smug and said "what do you mean?" and i told him, i had just been sitting in my car the whole time while he banged his door into mine and now he's walking off like it never happened.
the dude actually had the nerve to play dumb and said he didnt do anything, even though i witnessed the whole thing and felt his door rock my car when it hit.
so i exchanged a few choice words, called him what he was - probably not the nicest thing to say to a guy infront of his child, but i was venting.
he ended up just walking off giving me the finger and returning a few words. so i took down his car rego, make and model and got my insurance to take care of it all, i had to give a written report and they took him to court for the money.