If you hear yourself talking, will you want to shut up?
Yes. Apparently, hearing your own voice delayed and repeated back by even just few hundred milliseconds is enough to drive even the chattiest person more than a little bit nuts.
A device invented by the Japanese duo Kazutaka Kurihara and Koji Tsukada – the SpeechJammer – creates what is called delayed auditory feedback. It has a few uses (and most could be perfectly useful in business settings, for example) but the really delicious fun has to be the possibility of infuriating raucous people in quiet places. Whether that person is close to you or far from you, you can adjust the settings to dial up the annoyance factor to mega-obnoxious – just like them!