Scariest monster encounter?

[Krokberg]

Every encounter.
The Kraenk was horrifying, but not the worst (though I had many pauses when playing that part). The Choir was one hellhole, I could hear it coming for me, but not having any idea from where, and when I finally saw where it came from, it was too late. Also, once it was coming for me, I managed to hide, and it began patrolling past me, right in front om my nose. Horrifying, I tell ya. And when I finally got away from it, it changed its patrolling path. I found a way better hiding place, certain I'd be safe, just to have it randomly go right where I was, and stab me in the back. Because of that, the Choir is to me the scariest map of TDD. Also, the encounters in the Storage were so nerve-wracking. Especially when you're running for your life from the grunt downstairs, only to end up in the claws of the one upstairs. Had a slight heart-attack right there.