White Heat = Scarface + Psycho. Cagney sits in his mother's lap as they plan their heists together with plans provided by classical mythology. In the prison canteen, they tell him she's dead, and he lurches, whimpers, and punches everybody in his way. Finally cornered by the cops on top of an oil refinery, he yells 'Made it Ma, to the top of the world, Ma!' and empties his gun into the gas tank to join her in gangster heaven. Despite chronology (deranged by the censor's influence on the studios), this is really the fitting climax of the '30s gangster movie.