It would obviously depend on the circumstances.. if it was a genuine accident ie the guy opened the door and the wind blew it a little more into the car they would likely be no damage and if he had appologised fair enough.. if however he had just been a clumsy twat and opened the door to far knowing full well your car was there then i would 'politely' ask him to be a little more carefull in future when openeing his door.. people cars could get damaged
CheeRS
Phil