>customer decides to go have a normal one after I made the mistake of trying to fill in the required information
Me: "And where is your country of origin, sir?"
Customer: "Well, I'm from what will soon be north Ukraine, but you call it Russia if you're a fascist."
[visible confusion]

@picandor
Obviously, a touchy subject, but man.... At least I hope he gave you a a normal anwser after this vent.