One June night, fans of the Boston Red Sox, a popular North American baseball team, understood nothing. Their famous stadium, Fenway Park, was fuller than usual for a regular league game when the team wasn't performing well and was at the bottom of its division. But on this night, just a few days ago, thousands of fans began to sing Yes sir, I can Boogie, a song by the group Baccara, made up of two Spanish women who made a fortune with some hits in the late 70s. The Red Sox followers understood nothing, but they let themselves be carried away by the good atmosphere and many also began to sing the song, surrounded by 10,000 fans of the Scottish football team, many of them in the traditional kilt, the Scottish skirt. The United States has been invaded by the Tartan Army, the Scottish fans. An army that always seems to win because everyone lets themselves be invaded when it arrives.