Humm....the girl getting DP'd by a great dane and some black dude was pretty nuts. I had to watch the whole thing of course. Much like a gory car wreck, ya just can't look away from nasty porn.
Actually, the one thing that really sticks out in my mind is when some guy sent me a kiddy porn clip. THAT grossed me out...I saw maybe 30 seconds of it, and it disturbed me greatly. I went so far as to report it to the police, but of course there's not much they could do....