Monica Potter is the love object of iconoclastic fellow medical student Robin Williams, who sets out to prove to her, as well as his protege, his crusty roommate, and the big bad dean, that laughter’s the best medicine. The perfectly acceptable shtick executed by Williams—whose I-know-you-better-than-you-know-yourself seduction techniques ought to make him a hotter leading man—occasionally justifies the relentlessly light tone of this preachy 1998 comedy-drama. But a desperately timed plot twist is unintentionally funnier than much of the rest of the movie, and the revelation of some dark back story inadvertently mocks both a serious subject and the convention of explaining a character’s personality by means of a concisely confessed trauma. Tom Shadyac directed a screenplay by Steve Oedekerk, based on the life of a real doctor; with Daniel London, Philip Seymour Hoffman, and Bob Gunton.