Titanic  

It’s crazy to think that one of the most famous lines from the ultra-blockbuster hit that was Titanic wasn’t scripted. Leonardo DiCaprio’s real introduction to the world was through his infectious, positive Jack Dawson.  

When Dawson sees the view from the deck of the ship, he can’t believe his luck, considering he just won the tickets on the boat earlier that day. He joyously whoops “I’m king of the world,’ a line that DiCaprio originally made up prior to the shoot that drunk young men have shouted ever since. Director James Cameron loved the  line and added it to the script.