The Nutty Professor

Sweet-natured, university scientist Sherman Klump is understandably insecure about his immense weight, particularly after meeting pretty grad student Carla Purty. He is conducting experiments in the hopes of inventing a formula that will instantly make one thin. After a disastrous date with Carla (in which a vitriolic stand-up comic makes Sherman his target), the desperate researcher swallows the formula before it's been perfected. The solution not only makes Sherman thin, it transforms him into a smug, obnoxious cad named Buddy Love. Buddy also begins dating Carla (and gets sweet revenge on that comic), but drinks more and more of the solution in an effort to erase Sherman Klump forever. However, the formula has a major side effect: Buddy continually transforms back into the corpulent Sherman, without warning -- and at the most inopportune times... (official distributor synopsis)