First, some background. I have aphantasia, and for years I didn't get any visuals from psychedelics, experiencing only the mental effects.
I started to get visuals after my third empathogen experience. My first was 6-APB (MDA analogue). My second experience was on aMT. My third experience was 6-APB again, and visuals simply started to appear. Ever since that time, I can get visuals from psychedelics, but they're like 20% of what others report to be able to visualize. While I do get CEVs, I'm still unable to visualize with my mind's eye while sober.
So, my first time was actually on the comedown of a low dose of 2C-E. I was pretty much sober at the time, so it might not really count as seeing something on a psych.
My GF took the same thing, but a couple of hours after me, so she was peaking. We were both laying down on a bed, and my face was pretty close to hers. She attempted to enter a regressive hypnotic trance while on it (yeah, she's one of those), and tried to partially channelize the entity responsible for messing with my astral body on a previous trip (I had a shitty time). It turns out that it was a reptilian. I tried to question it to no avail, he mostly laughed at me and the few times it talked was to mock me. But at one point, something very weird happened. It was like a shadow started to overlap with her body, but it was only for a couple of seconds and I was too skeptic to believe my own eyes. It happened a second time, for a while longer. And then it happened a third time… but this time, it engulfed her body completely, and turned around to see me. It proceeded to pass through my face, immersing me into absolute darkness for no more than 2 seconds. I didn't feel anything negative. I can only assume that it was trying to scare me from trying to inquire any further, but the excitement I felt from experiencing the supernatural for the first time left me speechless and feeling amused rather than scared.
I was skeptic of the whole hypnosis thing, but this experience made me cross the agnostic threshold, and it made me understand that there is a transcendental reality that lies beyond our five senses.
I had a second supernatural experience, but is not psych-related. I'll tell you about it anyway:
It could have ended ugly. I had a friend that was involved with the umbanda, but had recently distanced himself from it. He had a Jesus sticker on the door of his bedroom, a cross on the wall and an open bible next to his bed. He was trying to become a good christian, but he had been experiencing nightmares and visions of what he thought to be the hell.
My girlfriend agreed to make him enter a regressive hypnosis to find out what was going on. In short, there were covenants in place with dark entities that weren't broken despite his renewed faith in Christ (he had become a believer a year before, I think). During the trance, he became possessed by demons, and when we tried to ask God for help, his whole chest went upwards and said in a very deep voice "But he isn't here with you", while a pulse of energy went through me and slightly pushed me backwards. I definitely felt that.
Keep in mind, me and my girlfriend had nothing but our faith to deal with that situation. We were able to keep the demons at bay and make him come down from the trance, but it was a pretty close call. Thank God he wasn't able to do any harm to us.
>stay away from reverse pentagrams
This can't be emphasized enough.
I think the music app on my console got glitchy once when I tried to set a playlist on it while on a psych. It's possible. I think that, when you're on a psych, you become some sort of energy conductor, and entities might be able to channel energy through you. Why would they do that? I don't know, but they can be some really obnoxious buzzkillers.