Just pay them back, silence Neighbours By Transmitting Your Music To Their Speakers http://www.lifehacker.com.au/2011/1...by-transmitting-your-music-to-their-speakers/
If that is really possible, that's the best. The choices of music/sounds/speeches you could send is endless. Opera, jimi Hendrix, screaming hitler speeches, whale sounds, etc. And when it's happening walk outside and look puzzled like everybody else in the neighborhood. Great entertainment.