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After failing at a last minute ploy to save his relationship with his fed up girlfriend, a man ends up taking care of a 5 year old boy who is his best friend's son. His best friend is out on a business trip and the man ends up developing a relationship with the boy. Soon after, he learns what responsibility is all about.
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Sonny: I'm thinkin' about keepin' the kid.
Phil D'Amato: Sonny, remember that time you went with me to the pet store to get fish food and you saw that cute little puppy and you wanted to get it, but then I reminded you about feeding it and cleaning it and toilet-training it?
Sonny: Yeah...
Phil D'Amato: Well, this is kinda like that - except with a human!