—>Here's an example of that annoying noise that's supposedly being used to drive teenagers away from stores and other places where they tend to gather and formulate their plans for world domination. It has also been used in commercials. Supposedly, only people under 25 can hear the noise. For the record, our staff can hear it and we think it sounds like that ringing in your ears that happens when people are "talking about you." Annoying. [Teenager Audio Test via BuzzFeed] (Photo: Karl O'Brien)