This isn't exactly the same thing, but in Back to the Future 2, there was a newspaper headline that read "Thumb Bandits Strike Again" based on the fact that people could pay for things by scanning their thumb print, and hence people were cutting said thumbs off of people to gain acess to their money. Well the same thing applies here. If you pay for something with a micro chip in your hand, then someone is going to start cutting off hands. And then there is the whole "end of the world" deal.