A while ago, I wrote about an inventor in the UK, who’d made a machine that emitted a very high-pitched sound and could be used to make loitering teens go away. Apparently only they heard the noise, and older people were unaffected. Well, the teens have now turned this around, and are using the same high-pitched, mosquito sound, as a ringtone for their cellphones. This way, teachers and other authority figures can’t tell when they receive text messages or calls on their mobile phones. 😉

If you’d like to hear it, just play it below. You can even download it if you like.