https://xkcd.com/316

Set up a mic and play back their own music after a delay, loud enough for them to hear. Don't open the door if they come.

solutions

The real fun option is using the cb option above to have ‘god’ tell them to turn down their music by setting the frequency to a high enough level that you can speak through the cb every time they play music right into their speakers. You can also speak through their speakers when they’re off!

Or blow them all up.

You blast music right back, but not just any music. Blast Wannabe by the Spice Girls, but make it just a loop of the intro, like 10 hours of "So tell me what you want, what you really, really want I'll tell you what I want, what I really, really want"

That is a difficult one. Maybe you can boost the volume when he sleeps? In that case he sees/feels what you’re experiencing. Just make sure your other neighbour doesn’t hear it.

Another thing you can do is create a device with a timer that hits the wall every now and then. I saw someone made it for his neighbour and it hit the wall about every 30 minutes so his neighbours couldn’t sleep..

The best way to get a (petty) revenge is by fucking with someones sleeping pattern. If done correctly you will bother him for the whole day!

If its a house and its summer tonnes of birdseed in their yard, handfuls upon hand fulls. Then let the birds do the work.

I knew someone once who salted insults into someone's lawn. That shit never grows back either.

liquid ass

Apartment or House?

I once had to tell the Indian couple above me to turn down their insanely loud Bollywood movie fest. When they came to the door the wave of noise that came out was like standing next to a speaker at a Motorhead show. I don't know how they could stand it. They did turn it down finally.

This is the same couple who, based on the noise, sounded like they would take all of their pots out of the cabinets every night and drop them on the floor followed by a bag of marbles. Every, damn, night.

If you live in the UK you should report the issue to your local council. You can use this link with your postcode (for anyone in the UK with a similar issue) https://www.gov.uk/report-noise-pollution-to-council

Take them to court for excessive noise.

Start mowing your grass, leaf blowing, etc. first thing in the morning, as early as legally allowed, for hours. If he asks you to stop, just ignore him.

Piss disc.

Have you tried being louder? Maybe they can't hear you over the loud music.

Research frequency that literally makes people feel ill, nausea... set up. Wear ear plugs and leave for a while.

No idea if this has ever worked.

Cricket balls/bricks/Molotov cocktails through the windows

Spam their phone. They won’t hear it.