This is really a great example of multi-threaded stories, obviously inspired by (hell, they even mention it) "Strangers on a Train", this is actually a fine idiot's version of that. Imagine a braid, but one of the strands careens off and crashes into another strand and then it completes anyways, it should look like an Escher sketch: that's this movie.
It's fun. You get 3 quality actors to be some of the worst people you could write (Kevin Spacey, Jennifer Aniston, and Colin Ferrell), and, not that first 3 were funny, have 3 quality comed... read the rest.