Maybe it's a bad habit, but I have my card numbers, expiration dates, and security codes memorized. I'm that way with random strings though; I know the VINs to

Maybe it's a bad habit, but I have my card numbers, expiration dates, and security codes memorized. I'm that way with random strings though; I know the VINs to all of my vehicles, and I even have the license key to my old Windows 98SE disk rolling around in my head, fifteen years after the last time I reinstalled it. It's not quite a useless talent, but it's certainly a boorish one.