My (now ex-) wife pissed off some of our neighbors once. The neighbors were assholes. Took their pit bulls out on walks without leashes in a community with a lot of young kids. Guy worked on his car all day on blocks in front of the house, in violation of covenants, got pissy when we complained. Asshole in general - those are just a couple of items to point out. I could never prove it was them, but they keyed my car (like $2k worth of repairs keyed it). Then, I was driving another car and it started to overheat, so I pulled over. Had it towed to repair shop. Someone had cut through the radiator hose with a knife.

This was in a pretty nice townhome complex in Virginia. We moved out of there shortly afterwards. Still makes me angry to think about it, but I'm not a revengy kind of guy.