though playing a raging alcoholic, grant is a teetotaller with an allergy to alcohol, preventing him from properly processing it. he had never been drunk prior to making the film. robinson decided that it would be impossible for grant to play the character without having ever experienced inebriation and a hangover, so he "forced" the actor on a drinking binge. grant has stated that he was "violently sick" after each drink and found the experience deeply unpleasant.