My neighbor likes to play really loud thumping music late at night or early in the morning. I’ve started fighting back by playing the loudest & most obnoxious music I can find.
When he did it a little while ago, I put on something really nasty by The Pogues and his music stopped.
Update: he started playing his music again and this time he didn’t stop when I played that CD again. He stopped when I banged on the wall really loud.