In Michael Caine's memoir 'Don't Look Back,' the actor recalls filming 'The Dark Knight' and witnessing late costar Heath Ledger transform into the Joker.

Michael Caine writes in his new memoir, “Don't Look Back, You'll Trip Over: My Guide to Life,” that he was actually “terrified” of Heath Ledger on the set of Christopher Nolan’s “The Dark Knight” (via NME).

Michael Caine shared his experience working on Christopher Nolan’s The Dark Knight with the late Heath Ledger and why he was “terrified" of the Brokeback Mountain actor’s transformation into the Joker