At last! A device that shuts people up

 
Let’s be honest, we’ve all dreamed of a remote control-like device that, with the mere click of a button, would allow us to “mute” a chatty co-worker or droning professors. But lo! Thanks to a pair of Japanese scientists dreams do come true.
 
Shaped like a speed radar gun, the SpeechJammer has the enviable ability to zap its target into a stuttering, or better yet, silent lump mid-sentence. As the video below demonstrates, all you need to do is point and shoot.
  
 
As your target babbles away, a direction-sensitive microphone records his or her voice and then a direction sensitive-speaker plays the recording back at a slight delay of around 200 milliseconds. The delayed auditory feedback is enough to garble just about anyone’s speech up to a distance of about 30 metres away.
 
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