What is a word that means "Psychadelic Nightmare"?

I read a word that was used to describe the original Willy Wonka movie's bad acid trip boat scene, the definition of the word was something like a circus of hallucinogenic nightmares and the word sounded like "cacophony". I think it started with the letter 'P' and the word is definitely an adjective.

Please help! Trying to find this word is driving me insane.


Solution 1:

Phantasmagoric;

Phantasmagoria " an exhibition of illusions "