A few years ago a gracious Estonian lady told me (over the remains of some salvaged wine) that I was nearly a true Balt as I didn't smile and I had collected all the unfinished wine bottles in the union canteen. She said it was a compliment.
Very interesting article, especially about the 'duty smile' - reminds me of an ex-Yank colleague of mine and the disguise of psychopathy in US culture.