I found this posted on another forum and was amazed at how similar it was to an experience that a friend of mine had: A roving chemist friend of mine who works with MHRB sent me this: "After 20+ years of psychedellic use I have just had the worst trip of my life. Preliminary tokes of the dark DMT felt and sort of tasted like unwashed DMT so I discounted it as some crap that the xylene pulled. The material is tan and has the consistency of wax without being oily. A friend was over and wanted to try it and not wanting to yuk up my DMT pipe and thinking that the stuff was shit anyway, I threw a few crumbs on top of a bowl of bud. 20 mg max. I really figured that it would just mostly taste bad. My friend took a hit, fanning the bowl with a butane torch and then he passed it to me. The bud was still burning and I just hit the top with a Bic, figuring that he had gotten most of it. PUT IT DOWN PUT IT DOWN PUT IT DOWN!!!!!! Fuck, I couldn't get rid of the pipe fast enough. I leaned back in my chair - Why did I do that? Fuckfuckfuckfuckfuck. NO NO NO I DO NOT WANT THIS I DO NOT WANT TO KNOW THIS!!! Please just let me out I'll never come back just make this stop. I don't know what I was reacting to, I was aware of no sensory input, hallucinogenic or otherwise, just that horrible feeling of NONONO. That went on forever and an instant and then I started to become aware again of my body and myself and I opened my eyes trying to pull out of that horrid fuckhole. Nope. Horrid fuckhole out there too. I had that crazy DMT vision where everything is fuzzy and lit from within and exists standing apart in it's own dimension but rather than the jewellike beauty of each atom, I was aware of the ugliness and nastlness of every line, shape, color, and texture. Everything was made of puss and overlapped and falling and oozing and suffocating and vomiting on me. I closed my eyes again and I became the uglines. I opened them and settled for just being suffocated by it. Around this time my hearing came back on line and I realized that the Tool album that we were listening to was no ordinary Tool album but a direct communication to me to reaffirm just how rotten and horrible every aspect of existence is. This came not as a paranoid flash of conspiracy like on MJ or acid but just as a fundemental understanding - like info gained from mushrooms. How can this be? How? How did they know that I'd be listening to this exact song right now? Despair washed over me as I realized just how horrible and squalid a thing everything that I'd ever known or loved was. The drug was wearing off. I white knuckled it back, said goodnight to my friend, and went to bed. The next day, it was still there. Nothing overt, just wearing a wet blanked of sorrow and despair about nothing. Beautiful things made me sad because I knew now what a lie it was. Nothing was nice. Everything had sharp teeth and wanted to bite. The feeling faded over the day and now (T+2 days) I have to think about it to bring it back. But it's still there. This was a trick. Something over there gets off on making us feel like that and used this drug to grab me. I think it's grabbed some other people too and that's what's wrong with them. I'd act like Dubyah too if I had to feel like that all the time. This could very well be merely a DMT trip gone bad. The substance was definitely used with inadequate preparation but I've used DMT under less than ideal circumstances before and never had it go that sideways. Such a small dose too. I'm sure that the total quantity in the bowl was less than 25 mg, my friend hit it first, I only had one toke, and in the morning I discovered that there was still some in the bowl. 25 mg of pure DMT doesn't get me as high as that shit did. It seems like it lasted longer than a DMT hit too, but I couldn't say for sure as I was too out of my mind to take note."
not to mention salvia, DPT, or 5-MeO-DMT 
