We’ve tried the usual of calling police (three times), inviting them over to hear how loud it is (they agreed that it was very loud), asking to at least reduce the bass, blasting our own music (not sustainable) and so on. Sometimes it works for a day but inevitably it’s back to the usual.
Hoping for some petty revenge ideas to complement the other efforts.
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!