Click on the green box at the bottom of this blog. Once you do that you will click to play a tone that is generally only heard by people under the age of 25. It has been used as a deterrent device to keep teenagers from loitering in malls and shops, and sounds similar to a buzzing mosquito. Typically the longer you listen to it, the more annoying it gets.
In case you are wondering, I did hear the sound and I can see how it would be annoying. Let me know if you could hear it.
Created by Train Horns