To be clear, I'm not saying people who watch this stuff are necessarily sick. I see a place in the world for disturbing, upsetting imagery as a means of confronting -- in an "it's only a movie" way -- the kind of horrors that exist in the real world. Some folks are more willing to do that than others. It just sounds to me like the whole thing is so gruesome as to be basically intolerable (especially some of the stuff in the 2nd film, from the sound of it). If you get your kicks this way, go for it. I mean, fortunately, it only IS a movie, but I dunno. From the sound of it, this series has a quality of...hmm....cruelty to it that I don't find in a lot of other horror films.
And to be honest, a lot of my enjoyment of horror nowadays is more the delightfully cheesy horror of the 80s. But hey, who knows. In 30 years, maybe folks will look back on the Human Centipede series and laugh at how awful the f/x are or whatever.
After reading the comments,I'm thankfull the link didn't open because it's rated 18+.
Desensitising oneself in order to adapt to or survive the horrors of this world seems to me like reversed evolution and is actually closer to sadism than sanity,and sadism isn't healthy for anyone.It's like a bad adrenaline rush that will result in perpetually redefining the boundries of what is acceptable until you yourself don't know anymore.
If anything,this world needs more compassion than cruelty.