My parents' neighbor was literally stalking my mom for a while, calling the police on her for things she did (that are perfectly reasonable and within the law) while she was out and about town, and started vandalizing their landscaping by cutting everything at night. That's not all, but those are the highlights. No clue why he was such a douchebag, but my dad thinks it's because he declined to buy insurance from him even though "EVERYONE gets their insurance through [him]."