Mark: I did a bad thing.
Anna: That's okay, you're allowed three.
(the above quote will mean nothing to you if you haven't seen the film)

The Invention of Lying is about a world where everyone tells the truth until one man, played by Ricky Gervais, learns how to lie. Hilarity ensues, along with a romantic comedy. Granted, the film is pretty funny, with the cast having a great time, but (and here's a thing I never thought I'd say regarding Ricky Gervais) they didn't go far enough with the concept.

Instead of making a sweet romantic comedy about religion and love, etc, they should've gone further, exploring the concept and this world. I mean, it was probably a really hard screenplay to write, because most of the excitement and suspense in any movie are secrets. In this film, there couldn't be any of those.

It's a sweet and funny film that I liked a lot, but if it would've taken its brilliant and genius premise and gone further out, creating something more unique, I think it could've been a classic in every way.