Top 10 Most Disturbing Horror Films

With Halloween around the corner and most horror films being crap, I figured it would be fun to see if I could come up with a list of the top 10 most disturbing horror films I've seen. What I mean by "disturbing" in this context are those films that made me uncomfortable and that I found myself unable to stop thinking about the next day.

Here is my list in no particular order:

1. Session 9
2. Eden Lake
3. Antichrist (The Criterion Collection)
4. The Strangers
5. Martyrs
6. Irreversible
7. Cache (Hidden)
8. A Tale of Two Sisters
9. Frontier(s): Unrated Director's Cut
10. Infection

I am not claiming that all of these films are good, scary, or that you will enjoy them. I loved a couple of them and found others extremely difficult to watch. What they have in common is that I found them disturbing, and they stuck with me for a bit.

I should also mention that the most disturbing film I have ever seen was not a horror film at all but a documentary called Jesus Camp. That one bothered me like nothing else, and I still haven't worked up the nerve to watch it again.