I guess I'm a lucky one in that I've had more positive than negative experiences with Ska Maria.
Probably the most profound experience I've ever had came about 2 years ago. I took 3 enormous bong rips of 80x salvia extract, and suddenly my body began the usual process of sweating and flattening me to whatever surface is underneath me.
This time was different, though. I felt like I was falling through a hole in the floor, and before I knew it I was floating down a tunnel.
To describe the tunnel would take forever, and my memory will never do it any justice. I can remember that the tunnel had these strange panels or windows, and when I caught a glimpse in one I saw organisms evolving. Sounds completely fucked, but I could literally see an accelerated Darwin chart playing out, with the landscape changing and organisms crawling out of this deep blue water and sprouting legs and changing. It was breathtaking.
I'd say the only part that of the trip that got to me was in some of the windows, I could see this weird looking creatures just staring at me as I was going down. Some had large grey heads and burning orange eyes, others were these funny little green things with reed-like antennae. It's hard to explain to people that haven't seen them, but after some conversations I had later on, I found out that a lot of people witness these strange salvia entities in the midst of a strong trip.
Then in the end, the tunnel just sort of dissolved out of my sight, and my consciousness became anchored again. I spent about the next hour drinking some green tea and looking up at my ceiling.