Double-Joint

In this movie Jim Carrey can't say no to any opportunity presented to him because its all for lols. Well, in terms of the story of the film it's because he goes to some self-help seminar where's he's told to do so. At the beginning of the film his life is dull, uneventful, and just generally sucks because he doesn't do anything. Then he starts to say yes to all sorts of things (like giving a homeless man a ride to some location and entering into a bar fight), and he ends up dating Zooey Deschanel. From that point on it mostly becomes a romantic comedy, so O: S P O I L E R S the two end up getting closer to one another while encountering lols, until they have a falling out near the end of the film, but then end up coming together right before the credits. 

The important thing is that Mr. Carrey is never presented with any truly bad opportunities (or at least none with consequences he really seems to regret (at least until several are made known to Zooey Deschanel, which leads to the previously described falling-out)). But, for example, he's never presented with the opportunity to develop an addiction to illegal narcotics or destroy all of his ligaments or something. Had he have been presented with such bad opportunities, it is unlikely that he would have had experienced positive results, possibly causing him to bail on the "yes" concept and therefor significantly shortening the length of the movie. There are also apparently tons of other people who follow the same belief of saying "yes" to everything in the film's universe, sooner or later a number of those people would find have to find themselves in some sort of serious trouble (there isn't some sort of magical or supernatural aspect to saying "yes" in the film) and the man promoting the whole thing would be shutdown. Also, if one were starting some self help program, it would seem like a good idea to at least make the concepts s/he decides to promote at least moderately-complex. If the whole deal is based around agreeing to do things, that doesn't give much incentive to purchase books or DVDs. Though perhaps the idea is to create a sort of personality cult by associating the idea with a single figure, causing people to feel compelled to give money in what ever way is possible.

- Cullen