[usr] My neighbor ran into my car! They didn't even leave a note! [sys] What?  That's awful!  How did you find out it was them? Did someone see it? [usr] I could tell by the color of the paint left on my car, and their car now has a scrape with the color of my car. I don't know what to do. [qst] [None] [bhv] I'm in a negative mood, please comfort me.
Oh boy.  I would confront them kindly and tell them you'd like to reach a solution without there being a fight or problem.  Those situations are never fun. Sorry.
My neighbor ran into my car! They didn't even leave a note!