Titanic
"I'm the king of the world!" was not in the original Titanic script. In fact, Leonardo DiCaprio tried out tons of different ad-libs before James Cameron settled on this one. He didn't even like it either! He thought it was cheesy and unrealistic, but the crew had to continue with shooting to stay on schedule. So, even though it became hugely popular, James Cameron still cringes at this line.
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