It's easy to say they're stupid not to know which US President goes onto what bill. But hands up who know what or who is depicted on any foreign bank note. I'd be surprised if any US citizens could describe without hesitation who or what's shown on the Canadian or Mexican bank notes.. and those are your neighbours. Hell, since the world has come to pay with shiny plastic cards probably most would have trouble stating correctly what's on a $100 bill.

@EJ - spot on...