I've seen worse than that as well, but there's one thing I can't bring myself to watch.
I've seen scat vids, beheadings, torture, whatever the fuck. Hell we all have. But the one thing I can't get the nerve to watch is a video of a guy who got a spider bite on his face, it got infected, he didn't go to the doctor, it got fucking HUGE and full of puss, and he recorded himself popping it/draining it and shit. I just can't fucking do it. I got about 4 seconds in to see this massive boil on his face and turned it off. Irks the shit out of me just thinking about it.