Foxcatcher
Did you know that the scene where Channing Tatum headbutts the mirror was actually not part of the script? Yes, the actor completely improvised that part in Foxcatcher. Ouch. It might have hurt, but at least no one can say that Tatum is a mediocre actor.
The Wolf of Wall Street
Margot Robbie was a fairly new talent when she appeared in The Wolf of Wall Street. She was able to demonstrate her acting skills and work ethic when she refused Scorsese’s offer to cover her up in the seduction scene. Robbie refused, knowing that it would not make sense for her character. She reportedly had to down three tequila shots before proceeding to film the part!