Lived in a small apartment block in London for a few years. Neighbour was a rastifarian who grew cannabis in his apartment to sell. Police were raiding him in the middle of the night about once a month. Often they would knock on my door at 4 am and show me a photo of him and ask if he lived in the flat next to me, before banging his door down.
White guy above the Rasta was a psycho who was bullying him. One day he unscrewd the hinges to the door to the floor me and the Rasta shared, which meant it was difficult for us both to enter/exit. So I did the same to his door.
One time I came home from vacation and my door had been busted down. The neighbour below had been flooded and blamed me and called the fire service out. They broke my door down believing a leak was coming from my apartment but it was from somewhere else.
The same guy complained when I bought an expensive punching dummy to train on, so had to bin that.
Another neighbour was the victim of a stalker who would put spiders and stuff through her letterbox. Eventually the stalker started leaving broken glass on the ground outside the apartment block which I trod on and it punctured my shoes.