Looking for a really funny prank to get someone good? Simply hide one of these evil light-activated Pranksters in their bedroom and they'll never be able to sleep again. While the lights are on, the small Prankster device stays quiet, but when the lights go out, it activates. Depending on which Prankster you get, your victim will hear the utterly annoying sounds of buzzing mosquitoes, a dripping tap, crickets or a dog barking. When they turn on the light to find out where the sound is coming from, it turns off again. They'll never find where the sound is coming from, so this prank could go on for years if you hide it well. It's perfect for hiding in bedrooms, college dorms, hallways, offices, garages, cars and more. I'm definitely stocking up.