The most recognized word on the planet is O.K. and Thai tuk tuk drivers certainly use the term often. The exact origin of the expression is uncertain, but the first place it appeared in writing was in U.S. President Martin Van Buren's 1840 re-election campaign. His slogan was 'Martin Van Buren is O.K.' which creatively referenced his nickname 'Old Kinderhook'. I wonder what percent of the world's population knows the word, 'Barbie'?