In his memoir, Michael Caine recalls the chilling impact of Heath Ledger’s Joker, which terrified him on set and forced the cast to step up their game.

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.

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.