Scariest horror movies?

I love horror films and try to watch a few each week. I enjoy all sub-genres, such as torture porn, slashers, psychological horror, found-footage.... The list goes on. There are a few films I can't bring myself to watch a second time, simply because I'm so scared. These are:

Sinister
Goodnight Mommy
Hereditary
V/H/S 1&2 (most parts are boring but some f****dme up)