Welcome to Britain, were the teenagers are ruling - and they know it...
Here is the latest attempt to try and control them - and I love it...
Mosquito, teenage control
In short it is a loudspeaker, that kind of like a dogs whistle, sends out a really high pitch tone that can be picked up by humans. As hearing deters already from the early twenties, only the yobs will be annoyed by it. Apparently you have to hang around for 15 minutes before it gets unbearable and thus the passing by baby in a pram won't be affected.
Think about when you were younger; you always knew when there was a TV on, even if it was muted. That is the kind of tune it sends out.
The whole thing can be bought online for GBP 495.00 (+VAT)