Umm, definitely the crab thing up there ^^^ . That's more than a little unsettling! Let's see, what else. Sleepwalking! I feel like if anyone I know did that and I actually witnessed it, I'd die of fright. I just don't understand how that happens. My sister-in-law tells me all the time that her kid goes all over the house in her sleep and has entire conversations. Nope.
Spiders are a given.
Sloths.
The existence of parasites that can live in the human body undetected for years.
And the cover on the 1980 Signet edition of The Shining. Whenever I was home alone in my parents house growing up, I was afraid to even go past the doorway my mom's room because I didn't want that scary face looking at me from the bookshelf, lol.