Want to stump a Brit? There's no need to confound them by showing them an unlabeled map of the U.S. and asking them to fill in the names of the States.
(Photo courtesy of BuzzFeed.)
Or even by asking them about American Mythology, i.e., what are the 4 Countries in the Land of Oz (Munchkin, Gillikin, Quadling, and Winkie).
Meet them on their own ground, and ask them when is Michaelmas (Sept. 29).
Or ask them to name the Channel Islands (Jersey, Guernsey, Alderney, Sark, Herm, Jethou, and Brecqhou).
For bonus points, ask them to name the Cinque Ports (Hastings, Romney, Hythe, Dover, and Sandwich).
Then ask them what a "-wich" is, anyway (a Town with salt deposits).