Disaster Index: 4.1 Entry: Unofficial Anthem Dependency Cause: A 1970s disco record, adopted via stag-do drag performance, now functioning as primary emotional infrastructure for a nation at its first World Cup in 28 years. Category: Historical / Emotional Evidence: "Yes Sir, I Can Boogie" has travelled from a 1977 Eurovision-adjacent release to Hampden to Fenway Park. The Tartan Army has invested it with weight no disco record was originally engineered to carry. The official anthem remains available and largely untroubled by this arrangement. Historical precedent: Scotland's relationship with unofficial cultural scaffolding pre-dates this tournament. The pattern of the unofficial becoming load-bearing is documented. Affected parties: Baccara (original recording artists, unasked); the Scottish Football Association (officially neutral); supporters requiring a coherent pre-match emotional sequence. Immediate outlook: The song will play. The feeling will be genuine. Whether it functions as fuel or sedative remains a live question.