Explaining on Instagram: "While filming The Dark Knight, Heath Ledger originally began licking his lips for a practical reason — to keep the Joker’s scar prosthetics from drying out and peeling. 😳🃏 Over time, Ledger leaned into the habit and deliberately made it part of the character. The constant lip-licking added an unsettling nervous energy, making the Joker feel unpredictable, restless, and deeply uncomfortable to watch. What started as a technical fix became one of the character’s most ic