Roughly 2,500 years ago, Greek philosopher Heraclitus noted that the only constant in life is change. Although it’s unclear how much ancient Muggle wisdom was included in the Hogwarts curriculum, Harry, Ron, and Hermione might have benefitted from hearing that sage observation, since the heroic trio experience almost nonstop upheaval in their third adventure, Harry Potter and the Prisoner of Azkaban.
It all starts with Harry using magic outside of school grounds—an offense that carries with it the risk of expulsion—when in a burst of (some would say justified) rage, he inflates his rude Aunt Marge like an enormous balloon. As she floats away, he storms off, only to be collected by the careening Knight Bus, which serves stranded wizards. At the Leaky Cauldron in Diagon Alley, he meets Minister…
