10) Titanic (1997)
When James Cameron directed Titanic, Leonardo DiCaprio's now-famous line, "I'm the King of the World," was not scripted at all. As Jack Dawson stands on the bow of the ship, with arms stretched wide into the air, DiCaprio is moved by the moment to yell out the line as an expression of the abandonment of his character.
Cameron loved it so much that he decided to keep it in the final cut. The line epitomises Jack's zest for life and his freedom in life, hence among the most quoted moments from the movie. DiCaprio's improv helped create one of the most lasting scenes from the Titanic, giving new subtext to the whole epic romance of the tale.
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Edited by Mudeet Arora