Most Disturbing Thing You've Seen?

A video documentary about a Japanese guy who ate a French woman (video on YouTube). He described the process and even made a manga about it. I'm not describing because I'm already on the verge of puking because of these comments
The process how they take dead bodies and preserve them for science exhibitions
(It's equally disturbing and interesting)
A lady who did a face transplant
My sister forcing me to watch disgusting videos of people getting Ginormous pimples/pores unclogged as well as parasites being removed from skin.

Pretty tame compared to these comments.
Some people said they felt like puking. I can actually guarantee this.