AvatarIf you saw 'Avatar' on Martin Luther King Day, you may have bought the ticket that pushed James Cameron's freshly-crowned Golden Globe winner over the $500 million mark in domestic box office. And you would have helped it become the fastest movie in history to hit that mark, a mere 32 days.

'Avatar's' next big target: the $601 million domestic gross of Cameron's 'Titanic' in 1998. Once thought impossible, 'Avatar's' takedown of its elder sibling is now inevitable.