White Heat - 1949

This is a famous bit from one of my favorite James Cagney pictures.  In "White Heat" he plays a psychopathic criminal named Cody Jarrett who has an unhealthy (to say the least) attachment to his mother.  Here he finds out about her death while in prison.  The story goes that Cagney was so into the scene that at least one of the guards he punched really got a full force fist to the face.