I've never heard of such a thing!

You've heard of whistles that only dogs can hear? Well now there's a cellphone ringtone that only teenagers can here! This, according to an article written by Paul Vitello and published in this morning's Chicago Tribune.

It was originally called Mosquito, "an ultrasonic teenager repellent, an ear-splitting 17-kilohertz buzzer designed to help shopkeepers disperse young people loitering in front of their stores while leaving adults unaffected." But with a bit of hacking here, and a bit of tweaking there - and the use of the Internet to transport the pirated sound far and wide - Mosquito was morphed into a ring tone pitched high enough for only kids (and presumably dogs) to hear, but not adults.

Now if you'll excuse me, my kid just told me my cellphone's ringing!