One of the neighborhood teens (spawn of the a$$holes that lived next door to me) used to park in front of my house, windows open, music blaring and hang out for what seemed like hours. My theory at the time was that their parents had put them up to it. Anyway, this went on a couple of Friday nights in a row until I decided that I had had enough.
I loaded a Cecillia Bartoli (operatic arias) CD into my stereo, opened the windows on the front of my house and cranked up the volume. It only took about 1 minute before they had taken their party somewhere else. Next week they were back and I did the same thing, they only lasted about 30 seconds. Interestingly enough, they didn't come back after that.