Putting your own unique spin on a character that has already been played on the big screen by acting legends like Jack Nicholson and Heath Ledger is no mean feat – but Joaquin Phoenix certainly managed it in Joker.

If you couldn’t hear the sounds of maniacal laughter in the distance as the Clown Prince of Crime suggests that maybe society is the crazy one, a new Joker movie is dancing down the staircase this Friday.

Phillips tells EW why Arthur made that surprising confession during the film's climax — plus, we reveal what that last shot means for Joker's real identity.