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Sonny Koufax (Adam Sandler) is a 30-year-old bachelor who has declined to take on adult responsibilities. He has a law degree but prefers to work part-time as a tollbooth attendant and live off of a $200,000 reward he collected from a auto accident. However, when his girlfriend, Vanessa (Kristy Swanson), indicates that she needs a break from him, Sonny decides that it’s time to grow up. Conveniently enough, a little boy named Julian (Cole and Dylan Sprouse) turns up on his doorstep, claiming that he’s the biological son of Sonny’s roommate, Kevin Gerrity (Jon Stewart). Sonny foresees, in Julian, an opportunity to convince Vanessa that he can face adult responsibilities. He thus takes charge of the little boy, pretending to be Kevin.