I couldn't make it through the human centipede either. I've been desensitized to everything that can be seen in the movies over the course of my life, and while the movie was disturbing, the reason I stopped is because it's just a bad movie. I heard about the sequel lol.
Anyways the last movie I watched was Raising Arizona. I'm a big Coen bros fan and now Blood Simple and Intolerable Cruelty are the only ones I haven't seen. I suspect Raising Arizona will be funnier/better when I see it again like every Coen bros movie. But as of now here is how I'd rank them in order of enjoyment.
1. Burn After Reading
2. Fargo
3. Big Lebowski
4. No Country For Old Men
4b. A Serious Man
5. The Man Who Wasn't There
6. Barton Fink
7. Miller's Crossing
8. O' Brother Where Art Thou
9. Raising Arizona
10. True Grit
11. The Ladykillers
12. The Hudsucker Proxy
All 12 I'd categorize in movies I liked so being ranked last is deceiving!