I am proud to be Canadian because Canada is a land filled with multiculturalism, comprised of people from all ethnicities, so much so, that in major metropolis centres of the country there are far fewer Caucasian citizens that foreign ethnicities. That takes the cake for me: Canada's wide appeal as a place where diversity brings people together as opposed to segregating them.
And of course most people have heard the "You know you are Canadian when…" My favourite one includes the one used in the Tide commercial:
“No self respecting Canadian says "let’s wait for a warmer day." -- Because much of the time, a warmer day is a long way off
Cheers