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.
YMMV: Call of Cthulhu
Fan Nickname: Gnarly (Nyarlathotep), Buzz (any individual Mi-Go) ETs (Elder Things), etc.
Old Man Henderson. Just... Old Man Henderson. That's really all there is to say on the matter.
High Octane Nightmare Fuel: All the typical Lovecraft stuff; cosmic horror, zombies, unfathomably ancient aliens etc...But then consider all the other mythos writers' creations that show up...And then add in some of the scenario writers' creations.
The monster that causes the problems in the scenario Crack'd and Crook'd Manse. A particularly graphic description plus the investigators realising just how big it is can call for a pretty rapid exit strategy from the characters. And the players.
The scenario The Colour of his Eyes from the San Francisco sourcebook. A man has a Colour Out Of Space (basically a form of sentient, malevolent light) trapped in his eyes, and he drains the energy from (and kills) anything he looks at.
