LSD.

In the early 90's there was acid and I spent the better part of three years tripping balls. During that time I experienced some of the most wonderful mind accelerating trips.

One night though, I was on about 4 tabs of white clinical and I witnessed something that was outer-worldly. Halfway through the night I can remember being completely tired suddenly and after raucous sex with my gf (she loved fucking on acid), I dozed off to sleep which was really strange for me because usually I'd be up until daylight but I was up for a couple days already so I just fell asleep around 4am.

Shortly after dozing off, I awoke to a very fucked up encounter. Four shadowy creatures were standing over me and I was completely unable to move. A clocktower device was intertwined from behind them as they inspected my mind somehow with human-like hands. One of them laughed and the other told me to stop fucking squirming only it was a direct knowledge and not in any language or sound. It felt almost hostile but like when a friend is mad at you, not like some one was going to actually murder you.

For a few minutes that seemed to drag on I could not move at all and I don't think I could breathe either. I felt asphyxiation overcome me although I could still see what was going on.

Images and things flashed through my mind when they were doing whatever the fuck they were doing until I was able to break free of the paralysis and I jumped four feet out of bed, scaring the fuck out of my gf.

Later that summer, I started experiencing fucked up grid-like visions where my room had many red dots that comprised everything... like if the world wasn't real but only an advanced illusion.

I stopped taking acid when a pattern emerged where the acid wasn't really doing anything for me in terms of thinking about the universe and merely just making me feel sick to my stomach or uncomfortable. For a few years I really enjoyed it, but it was a drag later on.