People who don't like teenagers have developed a high-pitched whiny alarm that only people under 20 can hear and use it to drive loitering packs of youths away from such highly cherished public spaces as convenience-store parking lots.
Now the teens have turned the tables on their elders by recording the sound and making it into a ringtone that only they can hear. That way they can leave their cellphones on in class and the teacher is none the wiser.
Sure, they could just put their phone on "vibrate," but where's the thrill in that?
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