Some crowds simply watch the game; others invade a city, repaint its streets, and turn its mayor into one of their own. Scotland's Tartan Army arrived in Boston with kilts swirling, bagpipes blaring, and a collective energy that quickly transformed the American city into a northern outpost of Glasgow. The scale of their arrival was measured in empty kegs, as bars across Boston ran out of beer and desperate landlords were forced to raid emergency supplies. When a metropolis runs dry because of visiting supporters, it is no longer just a fan base; it is a force of nature. The love affair was sealed in spectacular fashion when Boston mayor Michelle Wu pulled on a pink Scotland jersey inside a packed pub and signed a letter of intent to twin the city with Glasgow. The gesture, made on Thursday, June 18, was both symbolic and sincere, a recognition that the Tartan Army had brought something special to New England. From Foxborough, near the stadium, to Providence and downtown Beacon Hill, Scottish songs filled the air and television crews scrambled to capture scenes that felt more like a festival than a football trip. The soundtrack was unmistakable, with 'Yes Sir, I Can Boogie' and 'I'm Gonna Be' spilling out of bars and even infiltrating a Boston Red Sox game, complete with a parade toward Fenway Park. Captain Andy Robertson grinned as he described videos of the Red Sox crowd joining in, noting that one of the baseball club's owners had sent him a personal message of thanks. The Boston Globe responded with a full-page tribute to the visitors, declaring that the city would never forget the joy they had brought. Even the statues received a Glasgow makeover, sporting traffic cones in homage to the famous Duke of Wellington figure. If Scotland advances, a return to Boston for the Round of 32 awaits, and the city has already promised to stock far more beer.