Originally Posted by GopherPuckGuy
There has been talk at various times about using credit cards to not only open the door, but check you in at the same time. There are systems to open gun safes and other doors with a credit card. Would that be cool? But I suppose it's sort of off topic for this thread . . .
Kind of OT, but what the heck. I have seen hotel room safes that use a credit card as a key. For those (and those alone) I carry an expired / cancelled card in my wallet. Reason being, they're more likey targets for modding by adding a skimmer.