How it works is kind of cool, from a Spy Kids / Bill Nye the Science Guy perspective, but will the world be a better place if we use technology to enforce manners?

Kurihara and Tsukada suggested the speech-jamming gun could be used to hush noisy speakers in public libraries or to silence people in group discussions who interrupt other people’s speeches. —Japan invents speech-jamming gun that silences people mid-sentence.