What About Bob? (1991)

Synopsis: A new patient appears at a psychotherapist's door. He has every possible insecurity in the world. The amazingly successful shrink gives him a copy of his new book and goes off on vacation. Bob, the patient, discovers where the doctor has gone and appears at the vacation site, forever changing the shrink's family relationships.

Starring: Bill Murray, Richard Dreyfuss, Julie Hagerty, Charlie Korsmo, Kathryn Erbe

Genre: Comedy

http://imdb.com/title/tt0103241/