I used to have a neighbor that was a real jerk. My solution was to resort to sonic warfare. I didn't want to be obvious about it (since the guy was a scary meth head), so I'd use this cd that had really high and low frequencies on it. In the middle of the night, I'd run the high frequencies to make his dogs bark, or I'd just let a low frequency rumble (with my subwoofer), I'd even let off loud thumps with my subwoofer in the middle of the night. I'm sure he had no idea what was going on, but I know it had to have bothered him.