“The first time I saw him in action I was terrified!”

John Phillips/Getty; Stephen Vaughan/Warner Bros.

Michael Caineis recalling his time working withHeath LedgerinThe Dark Knight.

“He was a lovely guy, very gentle and unassuming,” Caine writes of Ledger.

Michael Caine attends a screening “My Generation” during the 61st BFI London Film Festival on October 8, 2017 in London, England, Dark Knight (2008) Heath Ledger

Michael Caine in 2017; Heath Ledger as the Joker in ‘The Dark Knight’.Credit:John Phillips/Getty; Stephen Vaughan/Warner Bros.

Brilliantly, Heath ramped up the characters psychotic side rather than going for one-liners.

Absolutely floored me the first time I saw him in action I was terrified!"

“He andChristian [Bale]were good friends and always having fun together.

Heath Ledger attends THE CINEMA SOCIETY and HOGAN host a screening of “I’M NOT THERE” at Clearview Chelsea West on November 13, 2007 in New York City.

Heath Ledger at a screening of ‘I’m Not There’ in 2007.BILLY FARRELL/Patrick McMullan via Getty

“Looking back, I think Heaths excellence made all of us raise our game.

The psychological battle between the Joker and Batman is completely riveting.

Are they in any way the same?

What nudges one man to do good, and the other to do evil?

The Joker wants to torment Bruce by convincing him that theyre two of a kind.”

“An accidental overdose, just tragic.

Heath was only twenty-eight when he passed away.

I hadnt even madeZuluwhen I was that age.

You think of what he might have gone on to achieve, its just heart-breaking.”

The actor notes that his costar’s death understandably changed the mood of film’s press circuit.

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“So it was just a very sad thing that he wasnt around to accept it in person.

Don’t Look Back, You’ll Trip Overis on shelves now.