Taxi Driver
"Are you talking to me. Are you talking to me... Well, I'm the only one here." This monologue might be Robert DeNiro's most famous lines in his whole career, but the Taxi Driver star didn't have any guidelines for this scene. His script simply said that he was supposed to talk to himself in the mirror. He didn't prepare anything, so on the day of shooting, he came up with the lines.
Harry Potter and the Deathly Hallows, Part 2
The Harry Potter franchise's final movie had to be as perfect as possible. The make sure of this, Voldemort's Ralph Fiennes said his lines out of order and did different actions so that none of the other actors would get lazy with their lines. Everyone was on their toes when Ralph was on-screen, just like how they would be if confronted with the real Dark Lord, Voldemort.
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