I recently attended a three-day workshop for my job. We had an American up from Portland to give the class. A very nice man with lots of good things to say about Canada. Nothing like hearing how great your country is to make you feel good, right?!
He particularly liked to point out the subtle differences between the US and Canada ... something I think we all do at times. One interesting observation he made was our use of the word Sorry. He was greatly amused that our buses said "Sorry, Not In Service" since he never saw it phrased this way in the States. He said you'd only see "Not In Service" ... he found the use of the word Sorry on the bus sign to be ... so very Canadian.
I thought about this a bit, and had to agree with him. We Canadians are polite to a fault at times. Even our buses are polite.