50. Inception (2010)
The Improvisation: “You mustn’t be afraid to dream a little bigger, darling,” advises Eames (Tom Hardy), as he shoulders Arthur (Joseph Gordon-Levitt) out of the way and whips out a super-huge firearm.
What Was In The Script: The “darling” part was Hardy’s own affectionate, plummy addition. “The ‘darling’ part was accidental,” the actor admits. “I came out with ‘darling’ and we kept it in because it was funny.”