Harry Potter and the Deathly Hallows, Part 2
There was no bigger franchise than Harry Potter, and the crew knew that the final movie had to be perfect. Ralph Fiennes who played Voldemort took some extra precautions to ensure such quality. He never, ever delivered his lines and actions the same way or in the same order. This way, all the actors would be kept on their toes during filming. He also improvised the line "Well, I must say I hoped for better."
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