I knew a guy in Glasgow who had spent a lot of money customising his motorbike the final touch was a fancy paint job.The same night he got the newly painted bike back two 15 year old boys poured a full tin of white gloss paint over it,the man complained to the father of the leader and was told to eff off and he knew the police wouldn't do much about it so he grabbed the main culprit a few days later and tied him up in a sack,put him in his cellar and gave him a severe beating with a baseball bat.There was a minor war over it with several severe injuries dished out,but no police were ever called and I'll bet that that boy thought long and hard about ever doing that sort of thing again.