Often I have "whispers" on DMT.
I don't trip often, but there are a couple examples I remember. In my most recent experience, I found myself in the presence of two entities which existed in binary opposition of eachother. The first to present itself I dubbed the jester, although I could not hope to do it justice with my description of it. It was red and angular with a fiery energy, let's say. Whether this was a force that exists in the world, or something emerging from within me, I have no idea. Importantly it was the spirit of some energy I had suppressed in my life and it had come to take back control. I could almost hear it whispering "smile" in my ear, and---well---it pulled my lips into a smile. Interestingly, there was some back-and-forth; it took all of the strength of my will to resist, and still I could not restrain myself for long.
Not quite starting a fight club under the control of an alter ego, but nonetheless interesting. It's almost like that comic trope of the angel on one shoulder, and the devil on the other, except you're a marionette and they're both tugging really hard and their morality is totally ambiguous. I find it fascinating that "being of two minds" can become a literal phenomenon with these substances.