my dmt experience was probably my most bizarre one to date, but it was pretty typical, so i won't explain it in detail. other than that, i think the craziest hallucination i've ever experienced was actually from dissociatives, not psychedelics.
one night, i snorted ~65mg of ketamine and started doing double balloons of nitrous in my basement while listening to juno reactor through earbud headphones. a whole host of insane things happened in the course of about 20 minutes (and 10 canisters), but i remember one part especially vividly...
i imagined that i was a big pink blob (kind of like jello or that nickelodeon gack stuff)floating in a vacuum. i was surrounded by an infinite number of other blobs, which were laid out in a grid pattern. it's hard to describe...imagine a sheet of graph paper with big pink dots on the corners of all the squares. remove the lines, make the dots 3-d, increase the size by a factor of 100, and transport it into outer space, and you'll have an idea what the blob-matrix felt like. i sensed that there was actually a number of other grid-planes above and below me, but due to my vantage point (my consciousness was hovering slightly above my "body"), i couldn't actually see them.
the blobs lost their 3-d shape and melted together into a continuous 2-d plane, then pulled back into their original shape. as this process repeated itself several times, i experienced a sense of total bliss and contentment. the part of my mind that was still vaguely aware of my humanity started wondering why i felt so happy to be performing this simple repetitive task. then, the answer suddenly appeared in my head: "because you are a blob, and merging with the others is the purpose of your existence. you are experiencing the joy that comes from fulfilling your ultimate purpose."
then, the nitrous started to wear off. i realized that i was sitting on my right headphone cord and it was pulling my ear slightly to the right, and that the tugging sensation had inspired the feeling of sliding down and melding with the other blobs.
later, i believed that i had been transported to another reality, which was governed by totally different laws and had no real distinctions between the 3 states of matter (solid, liquid, gas). i sensed that i was being given a choice - i could either remain in this other world, or return to my own. i decided that i would rather return to my own world, since i was more well-equipped to process and respond to the sensory input i received in it, and since it was more complex. coincidentally, the nitrous wore off at about that same time.