What do you think is the #1 monster in the Frictional Games Penumbra & Amnesia?

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I think that the water monster is just amazingly scary.

It's less of a monster. It's a presence.

It has no characteristics. It is just a splashing. You can't attach any sort of personality to it or anything. You don't know what it is, it just sits in the water, splashing and waiting for you to jump on, and then you just have to run from the thing.

With the other monsters, they can talk, or grunt, or at least seem somewhat human or have imagined characteristics. But the water monster is just nothing but a waiting, featureless predator.