These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Demonic Spiders: There are things you could call enemies in the game, although you can't fight them and they just end the dream early. They all count as this, since most of them come out of nowhere, are hard to dodge, and scare the pants off you. And then there's the Bridge Guard, who looks like Satan.
Face of the Band: Even though the game is primarily known for its screwiness, the Gray Man is perhaps one of the most well-known aspects of the game due to just how ambiguous he is.
Hell Is That Noise: Any of the badly-synthed, trumpeting noises made by the wandering residents of the game. Also, the slow footsteps of the Gray Man, even though his feet don't move.
Most Annoying Sound: The game has some spectacularly crappy audio, especially the deafening footsteps of...the player.
True Art Is Incomprehensible: Most, if not all, of the noninteractive video dreams seem to fall under this...unless anyone else can figure out the meaning behind watching a kid eating, a goldfish bowl sitting in an elevator, a montage of Russian stamps, and pigeons sitting on ledges, flying, and walking around. It's likely that this is entirely intentional, considering how little sense most people's dreams seem to make.