These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: You are being hunted by an invisible, superpowered, knife-wielding psychopath.
Nightmare Retardant: Unless you are the invisible, superpowered, knife-wielding psychopath. Then it's just cool.
Mmmm, fresh meat.
Paranoia Fuel: There's a psychotic invisible killer on the loose with enough strength to send people flying across the room by throwing a chair at them. He can see through walls as well, and may have found you by the time you've gotten to this sentence. Have fun.
Oh, and if he feels decidedly playful, he'll let you know he's run into a few of your buddies. By hanging their corpses from the ceiling.
Scrub: Most servers have the pig stick turned off because of complaints that it's overpowered.