[SPOILER] The best scares you missed.

[Googolplex]

But what do you mean about the hammer in level 1?
There is no hammer (except the tool item) and even not in level 1.

I remember a further hidden scare effect.
When you are in the choir, where the spiral staircase is, look at the cages.
In one of them is a corpse, but when you go up the stairs and went down again, the corpse isn't avaiable anymore.
I think. most players didn't recognize that.