The Curse of the 12th Man
Deep in the archives of Hookwarts, ancient texts speak of a peculiar enchantment that befell the residents of the Forbidden Pasture nearly a century ago. According to legend, a student named E. King Gill was summoned from the stands during a particularly brutal Quidditch match in 1922, creating what would become known as the Curse of the 12th Man.
Unlike ordinary magical curses that fade with time, this hex appears to be self-perpetuating. Those afflicted feel an overwhelming compulsion to stand throughout entire sporting events — a form of involuntary mobilicorpus that our Healers have yet to reverse. Witnesses report seeing thousands of cursed individuals rise in unison, unable to sit, as if controlled by a single hive mind.
Warning: Prolonged exposure to this enchantment may result in permanent standing, an inflated sense of tradition-based superiority, and an irresistible urge to explain the curse's origins to anyone within earshot.