After living here in the States for 12+ years, having someone ask me if I was Canadian because of my accent happens less and less frequently. Every once in a while, however - a new word will pop up and my conversation partner will falter and say, "You're Canadian, aren't you?" Funny how it almost comes out as an accusation with some people. In any case - the word?
I can't tell any difference in how I say it versus how Andrew says it - but apparently that one word was enough to paint me as Canadian.