This mechanical hand allows its user to double the size of their hand for the purposes of costume or for fun. It was created by Ivan Owen, who runs the ChainCrafts Etsy store that specializes in making armor, costumes and jewelry.
The mechanical hand gives you control over each finger on the hand, but it is a bit clumsy. You could use the mechanical hand to help you create a werewolf costume, as suggested by Owen, or maybe a Freddy Krueger costume is more up your alley if you're more into the horror genre.
Get your own mechanical hand by request by sending Ivan Owen an e-mail. Be prepared though: these gadgets cost $230 each. I guess that’s the cost of being a cyborg.