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In the 17 years since “Swingers,” Vince Vaughn has cultivated the comedic persona of an obnoxious and insensitive boor, so it may come as a surprise to learn that “Delivery Man” reveals a softer side entirely.

As David Wozniak, the world’s most fertile sperm donor, the star plays someone who’s overwhelmed as opposed to merely overwhelming. It’s a welcome change, though a significant marketing challenge as well, considering DreamWorks has almost no way of letting audiences know that “Delivery Man” is virtually nothing like a Vince Vaughn movie, but rather a heartfelt celebration of the act of parenthood presented under radically exaggerated circumstances.

Such sincerity comes easy for Canadian writer-director Ken Scott, who’s already told this story once before in the charming French-language hit “Starbuck.” Now, working in Hollywood, he demonstrates the good s