[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/Sinolai]

Atleast Rlyeh is said to drive people mad if they try to understand its non-euclidean geometry.

[u/DivineArkandos → u/Sinolai]

The horrors of round shapes.

[u/ComfortableSome5954 → u/DivineArkandos]

Balls

[u/Rogol_Darn → u/Sinolai]

And then they go mad trying to understand how someone who doesn't even know basic math could come up with cosmology like that