Forgot Your Wallet? Give 'em the Finger

Start-up getting financing for fingerprint technology... someday soon you'll be able to pay by just swiping your finger on a nasty gummed up pad at the 7-eleven. And you thought that the touchpad on the Debit Card screen was disgusting, just wait until everyone with a finger or ten has wiped theirs across a reader.
This disgusting downfall pales in comparison to getting mugged for your finger. Who knows, maybe there will be a black market for rich people's digits at some point in the near future.