Bill Bryson says lacrosse, taken from American Indians, is in fact evidence of early Scandinavian settlement of North America.
"Consider the matter of lacrosse, a game long popular with Indians across wide tracts of North America. Interestingly, the ruls of lacrosse are uncannily like those of a game played by the Vikings, including one feature - the use of paired team-mates, who may not be helped or impeded by other players - so unusual, in the words of one anthropologist, 'as to make the probability of independent origin vanishingly small'."
Must be the Viking blood in you. No wonder you don't spend all your time on handbags.