Disturbing movies...why would you watch them?

Personally I draw the line at movies like "A Serbian Film" and "Salo 120 Days Of Sodom," because I think at at that point, you may as well just watch a "Snuff flick" and I have no particular desire to. But, I do agree that it's some kind of challenge, and also liken it to seeing a train wreck. At some point, you have to look, and you can't simply turn away....We are strange creatures indeed!....