The Dark Knight was a massive hit that fans still regard fondly, but one of the film's biggest stars has some sad memories of the film's release.

Michael Caine, who played the role of Alfred in Christopher Nolan's Batman trilogy, recalled the surprising transformation of late actor Heath Ledger for his iconic villainous character 'Joker', saying that he was terrified when he saw the actor for the first time in action on the sets,

Ledger's method acting in The Dark Knight resulted in a breathtaking performance, although it seemed to have taken a toll on his mental health. In his new book Don't Look Back, You'll Trip Over: My Guide to Life (via People ), Caine spoke about his relationship with the late actor. He mentioned his temperament, offering: