turning the teen tables

Boing Boing shares the tale of a British company called Compound Security that has developed a sound - marketed to shop owners pestered by loitering adolescents - which can only be heard by teenagers and was originally designed to torment them into fleeing the retail establishment. Instead, the crafty youth co-opted the sound for their own devices.

Schoolchildren have recorded the sound, which they named Teen Buzz, and spread it from phone to phone via text messages and Bluetooth technology...Now they can receive calls and texts during lessons without teachers having the faintest idea what is going on...A secondary school teacher in Cardiff said: 'All the kids were laughing about something, but I didn't know what. They know phones must be turned off during school. They could all hear somebody's phone ringing but I couldn't hear a thing.'

Conceivably, this sound could also be used to determine if it's time for you to just grow up already.
-