I've seen some very disturbing things in my lifetime. But the most disturbing thing I've ever seen was Break Your Face. ..To this day, I cringe. >.< ..I am not posting a link, so if you want to find it, you have to search for it.
Also, my boyfriend told me about Two guys, One hammer. If it disturbed him, then it must be a very horrific thing.. Because he doesn't get disturbed very easily. I refuse to watch it, just from what he told me.