After seeking help from noted psychiatrist Dr Leo Marvin (Dreyfuss), Bob feels revived. But when the good doctor skips town to go on a quiet family vacation, Bob, afraid of being alone, follows - showing up unexpectedly at the therapist's lakeside retreat. That's when the fun really begins! Bob innocently becomes the houseguest who just won't leave - endearing himself to the other family members...and, in the end, driving the stressed-out shrink absolutely crazy!

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