In an interaction chronicled by PC Gamer, eagle-eared Alan Wake fan and X user, WillieTPJ, posted the below clip, positing that Remedy signals quite early on that Scratch, Alan's malevolent doppelganger, is already inside the writer, possessing him. That's a twist revelation that comes much later in the game, but it turns out that if you hover the cursor around the prompts for Alan's photo in the Mind Place, you'll hear some spooky Dark Presence scratchings.
This would sound like the stuff of feverish conspiracies if not for the chiming in of one Josh Adam Bell, Senior Sound Person at Remedy, who confirmed that the audio foreshadowing was indeed put there for that exact purpose.
Did you stumble across this oddity in your own playthrough, perhaps thinking it was just a bug of some sort? Layer in ever more detail in the comments section below.