I love this scene from The Wolf Of Wall Street, although I wish the clip embedded above was the whole sequence - it starts sort of in the middle. There's a lot I love here, including Margot Robbie's awesome accent (she's Australian! I'm really hoping for a Supporting Actress nomination), but what really sends me is the moment when Leo just starts channeling James Cagney right in the middle of the fight.
By the way, this picture started circulating last night, and I love it. If you know who took the original photo let me know in the comments so I can credit them. I found it on the FilmStage Tumblr.