In The Dark Knight: Batman and Gordon find alliance with a newly appointed DA Harvey Dent to stop a vicious killer with a warped sense of humor known only as The Joker, a threat to both the good, and the evil of Gotham City.
Because he's the hero Gotham deserves, but not the one it needs right now...and so we'll hunt him, because he can take it. Because he's not a hero. He's a silent guardian, a watchful protector...a dark knight.
Wanna know how I got these scars? My father was....a drinker. And a fiend. And one night he goes off crazier than usual. Mommy gets the kitchen knife to defend herself. He doesn't like that. Not. One. Bit. So, me watching, he takes the knife to her, laughing while he does it. Turns to me and he says "Why so serious?" Comes at me with the knife,"Why so serious?" He sticks the blade in my mouth. "Lets put a smile on that face!" And..... Why so serious?