What is the best horror anime?
I've watched Shinsekai Yori, Gyo, Bokurano and a few others, some have almost done it for me, but nothing has really been what I'd call real good horror.
Boku no Pico comes to mind, although Triangle Blue is also scary in its own way.
If you like Bokurano, watch Boku no pico.
definitely boku no pico.
You say unrelated, but the scientifically inclined find an inappropriately visceral existential dread from that story.