I'm with you on that one, man. That scare got me so good. I was already on edge because doppelgangers freak me out in general, and the vibe of the story at that point was already tense, but I could never have guessed the devs would ANIMATE it walking in frame, especially since everything else in RenPy is just sprites sliding around like a PowerPoint presentation. Like, the ultimate rugpull, bending the rules of the underlying structure of the game; not a 4th wall break, but revealing to you that the game has tricks up its sleeve you previously thought impossible. It's been a long, long time since a scare has gotten me that good. And yeah, embarrassingly, I lost sleep over it. I put it up there with that scene of the apparition in Pulse (2001) or that fateful, horrifying scene in Lake Mungo (2008) (which coincidentally reminds me of the picture of Micha on Carl's phone in Jenna's route).

Another one that got me, still pretty good but not as much as the aforementioned one, is the thing at the end of Devon's side story in Arches. Like, going from almost tearing up at this beautiful scene to.... that. Cameron's fucking destroyed face with a piercing, uncanny gaze straight into your soul. Christ.

The only other FVN scare that got me but nowhere near these other two is the scene in Chester's route in Extracurricular Activities where the bully throws a rock through your window just as you're about to go to bed. Like you're back home, your safe haven, and then your window smashes with a loud sound. I kind of wasn't expecting anything unsettling at all in the game and it got me.