Jason Willow question

There's no magic formula for terrifying people, right? I get that everyone has different fears that slam down on their panic button but, with Halloween creeping up on us, wouldn't it be interesting to explore this premise:

There are fear factor's that can be turned up or down and used in different combinations to scare readers in any genre from horror through paranormal to action/adventure.

Here's my suggested factors with well known examples that score highly with me:

Blood, Guts and Gore: (5/5) Texas Chainsaw Massacre
How high is the head count, are body parts exploding off the page and the gutters running with blood?

Suspense: (5/5) The Shining
Does the jeopardy build excruciatingly well, perhaps desperate escape scenes, safe havens slowly being approached or protectors weakening/turning?

Character Likability: (5/5) Harry Potter novels
Is the protagonist fleshed out, believable, has a personality, a past and relationships? Do you really not want him/her to be sliced up?

Main Character Vulnerability: (1/5) Any James Bond => (4/5) Game of Thrones (only a 4 because there are lots of other main protagonist's still left to root for)
How likely do you think it is that the protagonist will die or be seriously hurt/tortured with lasting consequences or is there a heal spell that will make them all better again?

Supporting Character Vulnerability: (5) Hunger Games
How likely do you feel it is that the character(s) held dear by the protagonist will die or be seriously hurt/tortured with lasting consequences?

So, which factors press your panic button? What's your single scariest book and why– give it a score (1 low, 5 high) for the Fear Factor elements in it that worked to keep you checking the doors at night. Also, are there any other fear factors that I've missed out or can you recalibrate my scale with better examples (e.g. a book more gory than Chainsaw Massacre?)

Remember, there's no right or wrong here - I'm just after what works for you.

Cheers, Gareth