We once had sh*tty neighbours. They were awful - parked right in the centre of the 4 parking spaces that weren't even outside their house a lot of the time, and when asked to move, refused. When they were parked on the road, they'd watch people park up behind or in front of them and then call the police saying they'd hit their car.
One time, the husband came over to our house and screamed at my little brother (who was only about 5 at the time) "tell your f*cking dad we've called the police!" My poor brother was heartbroken at the time. The police came over and told us the neighbours had watched my dad deliberately drive into their car, leaving a mark. When we walked the police out to the car, it was clear that they'd made the mark themselves as our car bumper was 6" below theirs :-/ The police had a word but it turned out the wife's brother was on the force.
One day, I was driving out of the close on my moped and she overtook me in her car, then slammed on the brakes directly in front of me. Then got out and shouted at me for nearly driving into her.
They also used to collect up their dog's sh*t and dump it in the gardens of neighbours with dogs, then call the council.
Directly before we moved, my mum got her own back by printing a mock-up newspaper front page with their house on it, with the headline "NASTY NEIGHBOURS MAKE LIFE HELL FOR CLOSE". She actually took the time to write an entire report ending with "so it's the wishes of all in * close for this horrible, arrogant, nasty set of so-called people to move to Outer Mongolia at the first opportunity so they can all have their lives back." She got up in the middle of the night and put one on every windscreen... Genius.
We all got a visit from the police the day after but they nearly went mad trying to find out who did it. They then came to threaten us and ended up getting in trouble with the police themselves. Justice!!!