My local grocery store has one of these horrible things. I'm 22 and i can hear it. I hate that thing with a passion. Oh, and it doesn't stop young teenagers from wreaking havoc outside of the store either.

Crazy! a friend of mine just showed this to me. And then he also showed me this :

http://youtube.com/watch?v=Ha44nh0RK7U

It's the video cut and set to Therion's 'Wine of Aluqah.' It works disturbingly well.