I remember my mom telling me when she brought me to see The Neverending Story, I started crying when the poor horse drowned in the swamp. Some years later, I watched it in summer camp without any problems.
Now, don't any of you dare laugh at this, but...
There was one scene in Who Framed Roger Rabbit that made me really upset when I first saw it. Granted, I am autistic, which means I have the mind of a younger person at times, and being only eight meant I might have had the mind of a five year old or something. I think you know what I mean. To this day, I still can't even think of watching it, because of how disturbing I found it.