A fun comedy about a man who never can finish anything, in love or life.

Rating: Null/10 (9 October 2008)

In many ways has most of the typical British comedy elements, but much fresh material and very enjoyable entertainment.
Simon Pegg is Brit, Dennis Doyle, who we learn at the very beginning of the movie got very cold feet 5 years earlier at his wedding and just ran away, leaving behind a pregnant girlfriend.
Thandie Newton is the girlfriend, 'Libby' Odell, and in present time has a cute, 4-year-old son Jake. Dennis and she remain cordial, as he picks up their son for scheduled outings.
But on one of those occasions, Dennis is thrown into a mild state of shock as he meets American, Hank Azaria as Whit, Libby's new boyfriend. Things get mush worse eventually as Whit proposes marriage to Libby.
But Dennis never gave up on Libby, even though she has apparently given up on him, a perpetual screw-up who never undertakes and finishes anything. He just barely exists, and is even in trouble with his Indian landlord of his small basement flat.
It turns out that Whit runs marathons to help raise money for charity, and everyone thinks that is an admirable quality. So Dennis, "Fatboy", decides he will get in shape and run in the next one just 3 weeks away.
SPOILERS: When Libby accept's Whit's proposal Dennis gets discouraged and decides not to run the marathon. But friends, including one who has bet 5,000 pounds on his finishing the race, basically force him to run, reminding him that he has to start finishing things. He gets injured, but decides to keep on anyway, even on a bad ankle, finishing late at night. His grit captures the fancy of a whole TV news audience, plus his son and Libby, who show up and wait at the finish line. As the movie ends some time later, Libby has ditched Whit, and agrees to go on a date with Dennis. Maybe they will make it work this time.