The 'Hogwarts' Indoor Plumbing' meme stems from a tweet by the official Pottermore account on January 4, 2019, which shared a piece of trivia about how wizards handled their business before 18th-century plumbing. The tweet revealed that wizards previously relieved themselves wherever they stood and used magic to vanish the waste, a detail many fans found unnecessary, gross, and hilariously absurd. This revelation quickly went viral, becoming a symbol of J.K. Rowling’s tendency to add increasingly bizarre and unsolicited details to the Harry Potter canon. The meme is typically used to mock over-explaining in fiction or to express disbelief at strange 'word of god' lore drops.