In his new memoir, Don’t Look Back, You’ll Trip Over: My Guide to Life, the veteran actor opened up about working with his late co-star on the Christopher Nolan-directed film and the grief he experienced after his death in January 2008 at 28 years old.

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).

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: