James Cameron has done an interview with IGN and he talked about converting the movie Titanic to 3D. Shortly before the video interview concluded, IGN asked Cameron if he was aware of a Reddit thread that was trying to debunk the “door couldn’t hold both Jack and Rose” towards the end of the movie. Cameron argued that the surface area would allow both of them to lay on top, but it would flip if Jack tried to get on. Cameron also said that he would be interested in having Discovery Channel’s Mythbusters prove the mystery of buoyancy in a future episode. My guess is that Cameron has thought about this for a while and that is why he is confident about it.