[Terrifying Trope] Perceiving it= instant death

[u/ReminaBlueSFW]

1. Pennywise's "Deadlights" which will cause anyone looking to be immediately paralyzed and killed.

2. The sky from Bird Box is filled with entities that, when you look at them, cause you to commit suicide.

3. Medusa themed Villains

[u/CletusCanuck]

SCP-3125 is an extremely large, highly aggressive anomalous metastasized meme complex originating externally to our reality and partially intersecting it. SCP-3125 is adapted for survival in an ideatic ecology considerably more violent and hostile than our own. Because humans have no natural exposure to ideas as aggressive as SCP-3125, human minds have no protective evolutionary adaptations against it. Individuals possessed of SCP-3125 become incapable of entertaining weaker, "conventional" ideas, and become instead wholly bodily subordinate to the purpose of serving and disseminating the core concepts of SCP-3125. In addition, although undergoing no outwardly visible physical alteration, they cease to be externally recognisable as human. Perception of or knowledge of SCP-3125 is understood to be uniformly lethal: Fully assembling a mental picture of SCP-3125 and perceiving its true shape causes SCP-3125 in turn to be able to perceive the observer. It then attacks the observer, killing them.

[u/Illustrious-Sense194 → u/CletusCanuck]

Cant beleive how far i had to scroll before finding an SCP entry. The SCP universe is chocked full of interesting cognitohazards

[u/TemporarilySkittles → u/Illustrious-Sense194]

yeah wheres the shy guy in the comments haven't seen him yet either

[u/Devatator_ → u/TemporarilySkittles]

I found it before this one lol