I had been working at CERN for a bit less than a year, when my Russo-Israelian coworker, who had never visited Italy, erupted in a perfect "Porca puttana!" that made me question my manners in the office.
Ibyend to use Italian when mildly annoyed and German when utterly pissed off. How about you?
Me too! It just works ™.
I swear in Italian and Russian. Great minds think alike!