I was a little surprised that this wasn't already posted. There's "worst movie ever created" and "most disgusting/shocking movie scene" but I'm considering quality movies that you found unpleasant or otherwise difficult to watch. I'm not sure I want to watch it again, but my 1st pick is The Road (think I mentioned this before). I'm not sure I had the right impression since I last watched it as a child, but my 2nd pick would be Raging Bull. I'm not going to include Tetsuo as a third pick because I thought it was pretty crappy, rather than something that was aiming high.