American football fans are normally a fairly sedate lot but as the game grows in popularity, partly because the national team has become a lot more competitive over the last decade they have learned the ways of football fans all over the world. A few years ago their most rabid fans who call themselves Uncle Sam's Army came up with a brilliant chant at a game in Chicago against England. With a big bass drum behind them they chanted, "Boom, boom boom. we've got dentists." Brilliant.