Anyway, here's what happened to me 8 years ago.
I went on a holiday to Prague with my classmates, to celebrate end of high-school. We stopped in Vienna, at Prater park. My friend and I were hungry, so decided to grab a snack from a fast food stand. We ordered some hot-dogs, and then I went to my other friends who were asking me for some advice on what alchohol/ciggars we should buy. Before that, I went back to the stand and told to my friend at the fast-food stand :"You stay here, and keep an eye on this old idiot (who was working at the fast food stand) not to mess up something with the hot-dogs". Few minutes later, I returned. The "old idiot" looks at me and says in my native language:"Well, boys, are you from Croatia? Me too." My only tought in that moment was "Earth, please do open beneath my feet." I never felt so ashamed in my life.