This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / The Green Mile
Can anybody watch Delacroix's horrifically botched execution and NOT squirm? Deliberately sabotaged by Percy, the sadistic guard, the scene goes on for several excruciating minutes. Instead of wetting the sponge that goes on the head of the person sitting in the chair, he leaves it dry, which interferes with the conductivity. As a result, instead of a relatively quick execution, the poor man's head catches fire and he dies an excruciating, tortuous death. Making it even worse is that John Coffey gets to feel everything Delacroix is feeling - every agonizing second - during the execution. Frank Darabont stated such horribly botched executions - albeit with a few less special effects - actually happened in Real Life. Part of what led to the electric chair being permanently retired in the majority of the states.
The corpse itself made it even more frightening. Unlike Arlen's or Coffey's, where the corpse would only show minor burn marks, Del's shows the reason why they call an electric execution a cooking. Anakin Skywalker looked good in comparison.
A silver lining in a very dark cloud: Footage of this execution, along with professional testimony that it could happen, played a major role in "Old Sparky" going away forever.
Coffey stating he can still hear "pieces" of convicts screaming in Old Sparky's chamber, long after they've been executed.
Not to mention Paul's internal comment on it immediately afterwards— if what Coffey says is true, Delacroix is undoubtedly screaming the loudest.
The flashback to how Wild Bill kidnapped the two little girls is also incredibly disturbing. Seeing it go from shots of a happy family to the family's hired hand threatening the girls before raping and killing them is like something out of a nightmare.
Paul's fate. He ends up outliving all his family because he receives part of the life force of the death row inmate John's healing power. He believes this is punishment from God for executing John, despite him agreeing to the execution. As a result he's very much alive in the present day and in fairly good health despite being over 100 years old. And as Mr. Jingles is still alive and moving around despite being at least 64 years old, some math must be done: Mice normally only live less than four years. The average life expectancy of a white male in 1935 was 61. That means Paul is going to live at least eight hundred and seventy-six more years. Medicalcuriosity notwithstanding, it's likely he's only going to die if he kills himself.