For the most part, we all know how the Titanic ends. In history and the Hollywood motion picture. Leonardo Di Caprio's character "Jack" becomes one with the sea after the Titanic sinks and allows "Rose" to stay floating on a door to assure her survival! Leonardo DiCaprio sat down with MTV and his fellow co-stars Brad Pitt and Margot Robbie from their new film "Once Upon a Time in Hollywood," and were asked if they thought Jack could have fit on the door and survived. What do I think?! He totally could have! See what DiCaprio and his cast mates think below!