What do you guys find scary?

[Melvin]

I don't want to hear: Teleporting Naked Guys, those are jump-scares. You might be shock for 4 minutes, but it does not make the player feel that they're 1 with the character you know.

For instance, the bones that fell out of the deskdoor scare was a good scare because it was done by yourself. You chose to open that door up, you were not forced to be scared. I think that makes it more exciting for the player.

But now to the question: What do you guys find scary? (think of the use of sounds and stuff)