I heard about the theory related to Jack, the Titanic and him being a time traveler, I wondered about it, and I know you wondered about it, too. 

References: 
Titanic – movie (1997) 

https://www.instagram.com/reel/chdkradihdo/?igshid=ymmymta2m2y= 

https://www.cinemablend.com/new/here-most-insane-titanic-theory-anyone-ever-thought-up-69982.html 

https://www.ranker.com/list/titanic-jack-is-a-time-traveler-theory/jacob-shelton 

Music 
The UFO Files 
purple-planet.com