Mate of mine had bother with his neighbours keeping him awake with late parties. He'd spoken nicely to them God knows how many times until he got sick of it. Another party on 'til the early hours of Sunday morning, music booming through the walls. George got up
very early on the Sunday morning, about 2 hours after the party had fizzled out, and put a full sheet of 3/4" flooring chipboard up against the wall and proceeded to pass some time drilling holes in it with the drill on hammer setting
Surprisingly he didn't have any more bother with them!