Do you have movies that you saw once, and you're glad you saw them and would recommend to anyone, but you will never watch again?
I have one at the top of my list.
Schindler's List: Incredibly well made and moving, but so disturbing. Maybe the black and white gave it more of an authentic period feel, but I was just downright shaken by that one and I have never even been tempted to view it again.
Honorable mention, only because I have heard more than one other person bring it up, is Passion of the Christ. I have viewed it more than once, so it's not really on my list, but my mother said that she is glad she saw it once, but doesn't think she could get through another viewing.