Envy (2004)

Ok, Envy here's the plot briefly: Nick (Jack Black) and Tim (Ben Stiller) are neighbours and best mates, their families play together and they work making sandpaper together. Then one day Nick invents 'Va-poo-rize' a spray that evaporates dog poo and makes millions. Tim could have invested early on but had no belief in the idea. Tim gets more and more envious of Nick and all his money and his envy eats him up inside, forcing him to do crazy things.

It's a pretty average plot as comedy films go but the performances of Black, Stiller and Christopher Walken make an average film into a pretty good one. If you enjoyed School of Rock, Dodgeball and the like you'll enjoy this too.