James Cagney (like Nicolas Cage and possibly no one else quite so successfully) doesn’t really act, he performs. Call his character what you like, you are watching Jimmy Cagney.
WHITE HEAT
Raoul Walsh
1949
James Cagney, Virginia Mayo, Edmond O’Brien, Margaret Wycherly, Steve Cochran
Screenplay by Ivan Goff and Ben Roberts; story by Virginia Kellogg