Some of those are really scary shit. Some will give you nightmares or even traumatize. If you start talking in chat room or forums about "2 girls 1 cup", you will most likely get banned. :D

There are also some youtube videos that are so extremely weird and sick that it just makes you wonder how crazy are those people who have made those videos. :D
I will give you an example without actually linking the video.
Remove that one space after /
https://www.youtube.com/ watch?v=q5SZzFaAZyY