That's something you would probably never see here in Brazil. Good for you snowman.
The only time I hit a car I was trying to park and bumped the front bumper of the car behind me with my rear bumper. I got out of the car and asked a guy who was taking care of cars in the street (pretty usual here in Brazil, they get a few coins for that) if he knew who was the owner of the car. He went into a pizza house and came out with the owner. Explained what happened to him, the guy was not much worried about the incident. Gave him my phone number and got his. He said to not worry as a proper wax would take care of that. Huge relieve to me.