Theory about Jack being a time traveler

The theory suggests that Jack, the character played by Leo DiCaprio in the movie Titanic, is actually a time traveler. It is argued that certain inconsistencies in his knowledge and behavior indicate that he is from the future. For example, he shares information about events and styles that did not exist in 1912. The theory proposes that Jack's mission was two-fold: to save Rose from jumping off the ship and to ensure that the ship ultimately sinks.