Run Fatboy Run is a funny movie, but it's predictable. It's a low brow romantic comedy that has two of the funniest comics working in showbiz today. While Spaced, Shaun of the Dead, and Hot Fuzz are riddled with intuitive humor and cultural gags, Run Fatboy Run hits the low road with slapstick humor. That's not a bad thing - not always anyway.
Simon Pegg plays a man who we see leave his bride to be at the altar - pregnant. Years later, the out of shape Pegg is working as a security guard, sharing visits of his son with his ex, played by Thandie Newton. Pegg finds that his ex is seeing Hank Azaria, a high achieving American who runs marathons. To prove he can rise to the challenge, Pegg tries out for the marathon.
Run Fatboy Run is a fairly formulaic comedy yarn. Most of the comedy in the film comes from interactiong between Pegg and Dylan Moran, who plays Pegg's down and out friend. Moran tries to prep Pegg for the marathon. There is often a lot of physical slapstick humor, such as the now infamous blister gag. It's not as sharp witted as were used to seeing from Pegg. The reason it often works is because of the comedic timing of the two talented comedians' delivery.
Not to be outdone is Hank Azaria, of Simpsons fame. He has fun with his role, especially as he starts to drill into Pegg's character, trying to disgrace him. He's fun to watch, especially as he gets a little physical with Pegg.
The highlight of the film maybe the marathon itself. Having endured Pegg's trials throughout the film, you can't help but root him on. This is the core of the film, even if it some of it seems predictable. I felt somewhat unfulfilled at the end, maybe because of my expectations for Pegg. Take it for what it is, though. It's fun and cute. The characters aren't nearly as interesting as they could be and the humor's on the low side, but Run Fatboy Run is definitely worth at least one watch, but don't expect the returns you get from Hot Fuzz or Shaun of the Dead.