Don't this just beat all??

[nachoman]

That's why you also have to give the expiration date and often the security code off the back. What's the odds of messing all three up so they match another account?

The security code: yes. The expiration date: Probably not. When you get a new card, it usually has the same number with a different expiration date. As long as the exp date is after the current date, I don't think the systems know the difference.