Would be funnier with one of the new Barclaycards: swap your card to pay for groceries, see how thieves invisibly get your number, print a cloned card which is then used to access your bank account and to transfer all your money to Russia, where mafia associates can use it right away to pay for a plasma tv on the web which is then delivered to them in a few minutes. Closing shot of smiling Putin-lookalike turning on the tv by remote control.
From a comment by a frantic rfid-goon.