I did acid twice in the Summer 1986. My two friends wanted me to do it with them, so I finally agreed.
The first time was three hits (squares) of acid. This was super-intense visually and aurally. It begins and you have your normal mind. You're hallucinating but you realize it is the drug. After time, your mind becomes part of the trip as well, which was scary because I thought "I'm going to be stuck this way forever!"
But it was amazing to experience a reality different from the regular one. To see patterns in everything that are maybe really there with just a slight perception shift. This was a full-on visual trip. My friends had black-light posters and those things were mind-blowing. All the while we were listening to music that I soon realized was made for acid: 'Dark Side Of The Moon' by Pink Floyd, 'The Dreaming' by Kate Bush, 'The Changeling' by Toyah Willcox...
Also 'Hounds Of Love' by Kate Bush which, strangely enough, had me coming out of the trip as the final song on the album began, "The Morning Fog," almost like it was planned that way. "Waking The Witch" is TOTALLY an acid song!
The three squares lasted eight hours.
So, it terrified me eventually because of my worry over it not ending but the visuals and sounds were nothing I regretted.
One month later, my friends convinced me to try it one more time but to take less so I wouldn't be so overwhelmed. They gave me one hit which I barely touched to my tongue and then threw the square away.
This horrifying trip lasted 26 hours! Okay, it was mostly mind-fucking, not so much visuals or audio, although those aspects were there. I was paranoid beyond belief, and worried I would stay that way forever.
TIME HAD NO MEANING. The clocks sped up, slowed down, went backwards. I was watching MTV (this was September 1986) and I was watching a video which seemed familiar but I couldn't place it. Eventually, time sort of took a breath, and I realized I was seeing "Missionary Man" by Eurythmics, "Typical Male" by Tina Turner, and "Stuck With You" by Huey Lewis - all at the same time, melded together.
Paranoia was just awful. I was suspicious of everyone and actually "heard" the voice in my head. Not someone else's voice but my own actual real thought, but I heard them with my ears somehow. The speeding up and slowing down was so scary. Also, I guess there was a lot of speed in it, because I kept getting the feeling like there were steel rods in my arms and fingers (one of my friends said that is common on acid and it has to do with dehydration).
As the effects subsided mostly, I drove home (no problems) and on my car's cassette player was Berlin's "Masquerade" which had the lyrics, "So you reach for tomorrow, but tomorrow's more of the same", which, to me, meant this acid trip would last forever! It took a few more hours for the mini-hallucinations to stop. These were little things like hearing the phone ring in a different room in the house, where there was no phone. Or a piece of paper on the table next to me fluttering in the wind, but there was no wind at all. But my mind was better so I knew it was just a little hallucination.
I never did it again but I still completely catch references to acid or notice when things are made or meant to be observed/heard while on acid. It totally changed my perspective on reality and I don't regret it a bit, despite the terror both trips eventually filled me with.