Imagine, your friend is talking too much nonsense and won’t be quiet.
You’re a teacher and some students won’t keep their mouth shut in class.
How about a speech jamming gun? It’s a simple idea. Kazutaka Kurihara and Koji Tsukada created this to keep people quiet. When you speak and someone repeats it back just moments later, it stuns you and makes your brain inoperable. That’s what this gun does. It shoots back your own words just a bit after you say them. (Pennlive – Speech Jammer)
Watch the video.