I found this to be one of the funniest dark comedies I have seen in a long time. To me the plot and the characters all rolled naturally and convincingly. It is an inevitable facet of black comedy that it tends to work off caricatures, movies like any of David Lynch's or things like Barton Fink, etc. The dynamic depends on showing up the subtle madness that we see around us every day. What made this movie work especially well for me was that the characters were all convincing, all in their way sympathetic. I could relate to all of them, which made the final descent into madness that much more fun. They didn't have to quite be caricatures to make the completely insane decisions they made convincing.