Dammit we don't all say "eh", the same way not all Americans are morons. In fact I don't know anybody who says "eh". You have to come from some hole in the wall in the atlantic provinces or yahoo land out west for that.
I thought so too, until I spent some time living in the 'States and got called on it by my friends down there every chance they got! I'm originally from Toronto (rhymes with 'piranha').