In the 1999 film Fight Club, it is revealed that its protagonist the Narrator suffers from dissociative identity disorder and that some events were fabricated, which means only one of the two main protagonists actually exists, as the other is in the Narrator's mind [REF].
In the 2002 film Hero, the protagonist is identified as an unreliable narrator by the antagonist, who responds by constructing his own alternate version of the false story.