Never watched a splatter movie on shrooms, not sure if that’s a good idea.
Not a splatter movie, but Stalker was a hell of a movie on shrooms. 11/10 experience
Stalker is just a great film, drugged or not.
Stalker

Andrei Tarkovsky’s final Soviet feature is a metaphys­ical journey through an enigmatic postapocalyptic landscape, and a rarefied cinematic experience like no other. A hired guide—the Stalker—leads a writer and a professor into the heart of the Zone, the restricted site of a long-ago disaster, where the three men eventually zero in on the Room, a place rumored to fulfill one’s most deeply held desires. Adapting a science-fiction novel by Arkady and Boris Strugatsky, Tarkovsky created an immersive world with a wealth of material detail and a sense of organic atmosphere. A religious allegory, a reflection of contemporaneous political anxieties, a meditation on film itself—Stalker envelops the viewer by opening up a multitude of possible meanings.

The Criterion Collection
Still better than the Patience episode of Wondershowzen.