Funny enough I was in PetsMart and was fumbling around trying to find my card (which never saves me a dime anyway). The kid at the register said he'd take my grocery card because all you need is the same number of digits.

@Jnetty:

I can personally testify that if you hear from your intestines what sounds like a Mack truck hauling a half-filled tanker down a dirt road filled with potholes, then you've probably got salmonella.