The only problem I've ever encountered was when US pumps demanded a zip code. Of course, I'd just enter the only US zip code I knew of (90210). It usually worked.

I've since learned that you can use 00000 but that's not nearly as fun!

I've also grown accustomed to using 867-5309 (Jenny) when asked for a phone number to get grocery store "member" prices when I don't want to sign up. It works a charm.