Working in Canada, I've noticed this too, this great pride in trying to laugh at American's geography knowledge. This idiot at work was going off on me about how we're so ignorant towards Canada.
So I was like "What's the capital city of New York?" "New York", and kept going "What's the capital city of Washington?" "Washington DC", what's the capital of California, which is more northern New York or Boston, etc. After about 10 questions she was all red faced with anger, got all pissed off and slammed the door.
Well done.