LSD: I took ten hits of blotter. It should have been a lot, but I'm an acid hard head. Nothing profound, mentally-speaking, but the visuals were nice. I could see a crackle pattern which refracted light between objects in 3D space. Whenever I would adjust my perspective (moving my head left/right), I could see that the effect actually seemed to exist in midair.
Mescaline: I ate 18 inches of San Pedro cactus. An initial sleepy feeling gave way to intense psychedelic stimulation. It was like my mind was split into 20 different minds, all thinking individual thoughts. I could see energy pulsing beneath everything. It looked like brightly colored bands. I also saw a tunnel of eyeballs, like an Alex Grey painting. The stimulation was so intense I thought I might suffer a heart attack or something. Oh yeah, the trees outside were dripping up into the sky.
Mushrooms: Unknown amount; about two small handfuls. I could see the energy of the universe. There were positive and negative energies. The negative energies were trying to encroach upon my being. They looked like the tempting lights of Las Vegas, and I could see them traveling along my central nervous system. The negative forces were coming from some of the people I was tripping around, so I took a walk that night in Tweeker Ville, which is not normally a recommended activity, but it was something I had to do. At the end of my walk the negative energy was replaced by a positive blue light coming down from the moon. It was a heavenly gift and resembled electrified tree roots.
Cannabis: I ate about a joint's worth, cooked. Once again I could see the energy of the cosmos, this time represented as fluids. I saw how the energies combined to make matter out of empty space. The energies would combine to form subatomic particles, atoms, molecules, and then on to even larger forms. I saw existence as a bubble: outside the bubble were the positive/negative forces, undifferentiated, and it looked like TV snow. As the forces combined to create larger forms of matter, a bubble was created. Inside the bubble was life as we know it, humans being the highest form of matter in existence. I saw that when we die, our energy is reconstituted back into the universal slurry, with no memory of this life left intact. I hope this isn't entirely true

As I was coming down, I had a remote-viewing session in which I could see my grandmother, and that the reason her knee bothered her was due to missing ligament and cartilage. It looked like a 3D MRI that I could fly through, and see the different layers of.
DXM/Coricidin (bad drug): 12 tablets let me see the Akashic Records, a place where every decision and action every human has ever made is recorded forever as a sort of Fourier Synthesis. This was the first time I was introduced to such a concept. The Christian equivalent would be God's Book of Life.
Well, there you have it, sorry it was so long!