The Japanese have developed a device to stop anyone from talking with just the click of a button according to Metro. Taking advantage of a natural phenomena, the device muddies the users brain by shooting back their speech through a speaker at a couple millisecond delays. This makes the user lose track of their thoughts, and renders them unable to speak until the device is turned away from them. It's also thought that this device could be useful to keep people with stuttering difficulties from having fits.
Who would you like to shut up?
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Source: Metro (http://www.metro.co.uk/tech/892199-new-speech-jammer-device-stops-people-from-talking)