It was a debate that had raged since 'Titanic' hit theaters 15 years ago: did Rose leave Jack to die by not letting him up on the board as they floated in the ocean. James Cameron maintains that the board would have only been big enough for one of them and Jack died valiantly, letting Rose live. Others argue that they could have at least tried to fit work it so both of them could have survived. But would it have actually worked? 'Mythbusters' to the rescue!