Having a hand that doesn't do what you want it to do or does things on its own is horror flick fare. Two prime examples of this in cinema would be Evil Dead and The Hand. If those flicks give you the creeps, you might want to look away now. Researchers at Tokyo University worked with Sony to create a new and weird contraption that allows them to hack your body and take control of your hand. I could see this tech leading to some impressively control prosthetics with a few tweaks too.