Headline: New Gaming Vest Makes Virtual Fights Real and Painful. Says the article:

The idea of a gaming vest is amusing enough. Will there be a Monopoly version? Don't know how that would work, except when you go to jail the vest stabs you in the showers, or something. But when your character gets shot in Call of Duty you can restore your health by crouching behind a rock, which is not exactly realistic. It beats previous versions of the game, where you'd walk over health packs conveniently scattered all over Germany - dropped, perhaps, by the Red Cross - and you'd be at 100% again. In the new versions you're warned that you are wounded, and should seek cover. There's some panting, some redness around your peripheral vision, and then you're back on your feet and ready to go. It's a game, of course, and no one would play a game that cost $60 if you were shot in the first few minutes, killed, and the game never booted up again.

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Fun! But I like the idea of a shoulder tap: you turn around, and there's no one there. Faked you out! Millions of dollars of research, the brightest minds of their generation, and they've invented the equivalent of someone on your right reaching behind you and tapping on your left shoulder.