Why do you play Call of Cthulhu?

Do you play to feel fear? To solve a mystery? To experience a slow build-up of tension before the release? Are you a cthulhu mythos nerd who likes to guess what supernatural entity is behind the mystery? Do you play to inevitably have your character go insane and die? To peel back the layers of concisous reality?

With so many sub-genres of horror, I wanted to ask this question and get a litmus of what the most fun part of cthulhu scenarios are for people. I personally don't love slasher horror or a monster hunt, but love anything that makes me question reality.