I have dubbed this ultimate gamer geek accessory the Forearm Guard Of (Dice) Rolling, but creator Dia calls it the Dungeons and Dragons Dice Gauntlet. It's a hand made leather cuff that contains a LilyPad setup inside which automatically rolls a die, from d4 to d20, then presents the result on the screen. And the fun part is-you can make one for yourself, because Dia has included detailed, step-by-step instructions at the link below.
So now, when you roll a natural 20, you can hold your arm aloft and yell like a true Barbarian, for the proof is right there on the screen! Seriously though, hang on to your dice because you don't want the Dice Gauntlet to crap out on you when you're about to go heads up with a Beholder.
Link --via Topless Robot