Had a similar thing happen to me when I lived in Coventry from a drunk guy having a shouting match with his missus. I got up to see what was going on just in time to see him stride over to my car, kick off the drivers side mirror, then casually stroll round to the passenger side and do the same!
It was only an N-reg escort, but I'd kept it in good nick and there wasn't a mark on it... until then!
Didn't even bother letting the police know - no idea who the guy was, no cctv, no chance of catching him.
Made my blood boil!