ROLLING STONE: The Joker represents the last completed role for Ledger, who died in January at 28 before finishing work on Terry Gilliam’s The Imaginarium of Doctor Parnassus. It’s typical of Ledger’s total commitment to films as diverse as Brokeback Mountain and I’m Not There that he does nothing out of vanity or the need to be liked. If there’s a movement to get him the first posthumous Oscar since Peter Finch won for 1976’s Network, sign me up. Ledger’s Joker has no gray areas — he’s all rampaging id. Watch him crash a party and circle Rachel, a woman torn between Bale’s Bruce (she knows he’s Batman) and Eckhart’s DA, another lover she has to share with his civic duty. “Hello, beautiful,” says the Joker, sniffing Rachel like a feral beast. He’s right when he compares himself to a dog chasing a car: The chase is all. The Joker’s sadism is limitless, and the masochistic delight he takes in being punched and bloodied to a pulp would shame the Marquis de Sade. “I choose chaos,” says the Joker, and those words sum up what’s at stake in The Dark Knight. MORE