I saw the review of this movie on the "Rotten Tomatoes Show" and I was told not to read any reviews because they would most definitely have spoilers and ruin a very important plot point in this extremely dark comedy. I didn't and I was pleasantly surprised with what I saw, I can't say too much about this movie, but this will be a cult classic.
Some parts of the movie are really painful to watch because you feel so bad or embarrassed for the characters, other times you'll feel bad for laughing at them. Check this movie out, but remember, don't read up on it (you can "acquire" this in good quality if you know where to look).
