I can even tell what language different Europeans speak with 80% accuracy before they open their mouths. I guess working at an airport does that for you. Same with Americans, you can just tell if someone's American from the looks of them. Well, usually, at least. It's not that hard once you get the hang of it. Same with Asians - distinguishing the Chinese from the Japanese from the Koreans, for instance, is very easy, even if you don't look at the eyes. Africans all look the same though.
Also, azal, you and your cardigans