It's a bit long, but one of the greatest films ever in any state. I've watched this one shrooming on a few occasions.
It can get kind of scary but the script is genius and it's a great watch.
Not available on You Tube (that I could find with a quick search) but I just watched this on Netflix. I've never tried DMT myself, but the program was a good way to spend an hour of my vaped evening.