J.K. Rowling is back on Twitter. The Harry Potter author presumably said, “I solemnly swear I am up to no good” before explaining to a fan that reality itself has been altered by the wizarding world. When a fan tweeted Rowling about the whereabouts of his letter to Hogwarts — a common request from fans — the author offered a simple clarification — we all already went to Hogwarts together. Rowling even clarified for Muggles who might need a refresher on how fictional magic works. The author has a habit of updating fans on the evolution of the Harry Potter saga on social media. She has previously apologized for Fred Weasley’s fate and showed support of a cross-series Gandalf and Dumbledore wedding.