Harry Potter and the Deathly Hallows
A lot of the actors in the Harry Potter franchise played the same role for over a decade. There is no doubt that they were extremely familiar with the roles by the time they get to the last film, Harry Potter and the Deathly Hallows Part 2. Ralph Fiennes, who plays Lord Voldemort, actually kept changing the last speech in order to get genuine reactions from the other cast members.
The Terminator
We have another James Cameron film on the list yet again. This time, it’s for The Terminator. It’s a small gesture that would become completely unforgettable. We are, of course, talking about Arnold Schwarzenegger saying, “I’ll be back”. In the script, he was only supposed to walk away in disappointment.