Things like this make me grind my teeth…
Say you’re playing WoW, and you want to transfer your characters from one server to another. No problem, Blizzard allows you to do that for a $25 fee. But wait… there’s a catch. You can only pay this fee by using a credit card. No big deal, you say? Ah, but when you enter the credit card details, you have to also enter a valid US zip code. Not a valid postal code that matches your address of residence, mind you, nor even one that matches your credit card’s mailing address… but a recognized U.S. 5-digit Zone Improvement Plan (ZIP) code.
That’s a bit of a problem if you, say, live in Australia, and use a 4-digit postal code.