For me, my top choice is The Green Mile. I absolutely love that movie, but I can't watch it because everytime I see it I cry like a baby. It's too much for me, yet I really love the movie itself. Even still, I just cannot watch it.
Second runner up would probably be The Shawshank Redemption, but only for one part where the old guy kills himself. :( I can watch the rest of the movie but that one part kills me and I always have to leave the room and come back when it is over.
Do you have any feelings like this towards any particular movies? Maybe I'm just a big wuss!