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Japan's Scream Jar

You've probably seen a stress ball before. Well, this is kind of like that, only you scream into it when you get frustrated. While we've personally never tried it ourselves, the jar is supposed to muffle even the loudest of screams. That means you could probably take this thing into the room next to your boss's the next time you get fed up at work. The lip is also supposed to be able to fit different-shaped mouths.

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Luckily, the jar looks like it's small enough to be easily shipped in case you're in the market for a stress-relieving device of some kind. We imagine it works better than a stress ball, too.