Oh Jesus. You ask this on the internet? Let's see. I saw a video of that massacre in Russia by some muslim group. I forget the name. Anyway it's basically two men getting decapitated by a dozen other men, after having begged for their lives. Greatly disturbing, and when I had seen it all I just sat there and wondered why the hell I'd watch that.
And another, somewhat disturbing, but not to the same level, was seeing that Björk fan kill himself over the fact she had married a black guy. That was... just... weird.
EDIT: She wasn't married, she just had a black guy as a boyfriend. My mistake. Just makes it even more surreal.