Since OP won't tell, there are a few things I came across years ago:
naked yoga, there used to be lots and lots of porn-but-not-porn on youtube
real autopsy videos - you could easily find them when looking for anatomy videos, the most memorable one being done by a german crazy-looking guy wearing a hat while doing an autopsy on stage
There are others, but they were just plain illegal.
Okay, you guys win... Mine isn't nearly as disturbing as yours, but it's pretty weird nonetheless. Had to do a search for this one as it's been a while since I got it recommended by the algorithm.
I just randomly found this screenshot in my files again and decided to post it.
Sounds like Dr Gunther von Hagen's, he invented a the plastination method of tissue preservation that's used in countless medical and anatomy training schools across the globe.
He had a series on BBC/Chanel 4 as part of his "Body Worlds" exhibits and that's all over YouTube, as part of promotion for the new technique that let him preserve entire intact body systems. Fascinating stuff if you're into general anatomical studies, or just body horror
The source of some of his older anatomical specimens is.... Controversial
BBC 4 has a bunch of autopsy videos floating around on YouTube. I vaguely remember the one with the blonde doctor from supersize vs superskinny dissecting a smokers lungs and a morbidly obese heart, and an alcoholics liver.
