As a kid when I would see movies there were always things that would disturb you to the bone. I can handle them better now that I am an adult but when I had first seen them they would haunt my every waking moment.
1. Seeing Owen and Beru fried to a crisp.
2. Watching Toth in Lost Ark melt.
3. The part in Superman 2 when his powers are being removed and it shows for
a second his face as a skull as it peels away his powers.
4. That ghostly face of Reagan in The Excorsist when the demon manifests itself in her.