How about Woody Allen in Martin Ritt's "The Front" telling the Un-American activity panel "Fuck You" after being a mild manner simp for the first two hours of the movie.  The scene is just a great release of all the tension, fear and claustrophobia that has built up and is so satisfying.

How come you didn't ask him about Silent Partner? My favorite Gould movie and one of my favorite crime movies ever.  Written by Curtis Hanson with a evil, evil Christopher Plummer and one of John Candy's first roles.