It’s the new cell phone ring that supposedly only teenagers are able to hear. I heard the sample tone, and it is one of the MOST piercingly irritating sounds I’ve EVER heard (I’m 37, btw.) If I was teaching a class where this ring tone went off, I think I would give the person detention for making me listen to it. Come on, is there actually any remotely significant section of the population who can’t hear this? Is it just a joke, or a dumb marketing gimmick??