Where did the Joker come from?Christopher Nolan’s film, ‘The Dark Knight,’ certainly doesn’t give us any clues. But though the character has many versions of his origin in the fictional world, his actual history is a multimedia mash-up of drawing, voice-overs and visual performance. He’s gone from evil clown to annoying clown, to dark, evil, murderous clown that gives you nightmares. And …
