Since I'm not a disgusting weirdo I don't have any weird cum/turd jerking/special interest stories to tell you.
At one point when my family was doing house renovations we had the task of re-doing some of the plumbing in the upstairs bathroom. Because of this somewhere along the way we had to saw through a sewage pipe. Liquid sewage (nice acidic combination of chemicals and human waste) was spraying all over me the entire time. Took about 3 minutes so I was covered in stuff by the time it was done. Not to mention that drain flies like to lay eggs in these pipes, so we had some insects flying out of the pipes as well. The smell was amazing.
I guess a close second would be at bootcamp a while back when a member in my platoon fell off a slight cliff overhang and scored himself a brutal compound fracture in his leg, bone sticking out, blood everywhere, had to help the corpsman field dress it. I think that was probably more traumatic than disgusting though.