The chemistry between Steve Coogan and Rob Brydon is the whole film. The two of them bicker and one-up each other constantly; over meals, on the road, and predictably (and brilliantly) at Coogan's parents'.

There's honest contrast on screen between the two men, and their life situations. Honest in so much as they choose to portray themselves, as this is a work of fiction. It's both played for laughs and very straight. I found it a beautiful balance.