Before going on a break, self-involved psychiatrist Dr. Leo Marvin has the difficulty of taking to a new patient: Bob Wiley. Marvin is followed by an exemplar of neediness and a compendium of phobias, Bob . Dr. Marvin attempts to get him to leave. The trouble is, everyone loves Bob. As his unaware patient makes himself at home, Dr. Marvin loses his professional composure and, before long, might be prepared for the crazy bin himself.