It's disturbing, yes, but I still see this movie as being good natured basically. It's pretty much a portrayal of how people react to different pressures in life -- some will withdraw from reality, some resort to violence, betrayal or blaming others as their burden... it is under such pressure that the good or evil deep rooted in one's mind comes into play -- in the end it's the "good" and "innocent" that is able to find the way out (although "evil" follows closely). Try looking at pressure and teamwork from a different perspective and see if you get any inspiration from this movie... Plus, I'm not sure if that was done on purpose but most of the audience felt rather stunned when the exit of the cinema led us into a narrow passageway (which looked rather "cubical") lighted in green...
