 The taxicab scene between Terry and Charlie, one of the most famous  scenes in the cinema, was not improvised, as Marlon Brando (qv)  claimed in his autobiography. When Brando did initially improvise  during the shooting of the scene, and Rod Steiger (qv) followed  his lead, Kazan yelled, "Stop the shit, Buddy!" to Brando, using his  nickname. The two actors stuck to Budd Schulberg (qv)s script  after that.