Adam Sandler stars in this comedy about the importance of fathers. The story focuses on Sonny Koufax, a lazy thirtysomething who has spent his life avoiding responsibility. However when his girlfriend, Layla Maloney (Joey Lauren Adams) dumps him for an older, more worldly-wise partner, Sonny realises he must do something about her, and fast.
His last ditch plan is about as ambitious as possible. When his friend Kevin is on a business trip in China, Sonny discovers that Kevin has a son. In an attempt to help, Sonny offers to take care of the child, while thinking it will help his relationship. In the process, he grows to love the child and tries to get custody. However, Layla makes it clear that she is not impressed in the slightest and Sonny also discovers that he can't return the kid. That's when the real mayhem begins.