PastVerse on Instagram: "During the hospital explosion scene in The Dark Knight, Heath Ledger delivered one of cinema’s most unforgettable unscripted moments. As the Joker walks away from the hospital, the detonator appears to fail. Ledger pauses, looks back, and fidgets with it in character before the building finally erupts. That hesitation wasn’t planned — it wasn’t in the script. The reaction was completely instinctive, and it fit the Joker’s chaotic nature so perfectly that director Christo