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Nightmare Fuel: The Cabin in the Woods
Jules' death is brutal.
Are you afraid of clowns?
The entirety of "The Carnage" could count. Can you even imagine being trapped down there with almost every nightmare creature imaginable?
One of the most horrifying things contained in the cells is Kevin. Kevin is a seemingly ordinary Stepford Smiler with the power to drain people's blood. To make matters worse, it's never explicitly stated how he drains said blood...
One poor guy literally gets his soul sucked out, and then is taken away to who-knows-where, to have who-knows-what done to him. While everyone else has really painful deaths, at least they die, and their suffering ends. That may never happen to him.
Just before their deaths, Mission Control are looking at a whole lot of small screens which are showing various people being killed by the various nightmares/creatures. Don't look too hard at these small screens. You won't like what you see. One of them shows a man being repeatedly and forcibly vomited on by what looks like hospital zombies. A man gets suffocated in a plastic bag by a crazy man. The doll mask people tie up a group of people, pour gasoline on them and drop a match as they leave the room. A woman is stalked by a monster she doesn't notice. A man is set on fire by a pumpkin-head creature.