A guy in England named Arnie Szoke went under the knife -- and had a doctor implant a bank card chip under the skin in his hand, according to The Sun. So now, he doesn't have to carry a wallet. Instead, when he's purchasing stuff, he just waves his hand over credit card readers.
Arnie admits that "using the chip takes a bit of learning" and that "you have to be more precise with where you tap" -- but he's happy with the results because he doesn't have to keep a wallet with him all the time now.