Get rid of pesky teenagers

Our hearing gets worse as we get older, especially our sensitivity to high-pitched sounds. UK entrepreneur Harry Stapleton turned that problem into a product, called Mosquito, that emits an annoying sound that only teenagers can hear. The rest of us can't hear a thing, so if you have a problem with pesky teenagers hanging out near you, just turn on the mosquito and watch them all run away.

You can buy it online for about $1000.