Once, I was photographing a weightlifting event and I was just off to the side and behind the action. Too many photographers with better credentials that I had, had already gotten to the "best seats" and I was stuck behind the lifters with only an occasional facial shot. As it turned out I was focussed on a three hundred pounder's torso from behind hoping for an emotional shot after the lift attempt, when suddenly I had the best seat in the whole house.
Not six feet in front of me this guy lost his guts out of his arsehole! Something tore inside with the creepy sound of a bass viol breaking a string and his tights popped a hole in them and right there was about a foot and a half of doubled up intestines and unrecognizables. *Motor drive camera whirring* It was gruesome! ... and a bit stinky and bloody. I don't need any reminders not to power lift.
That was a severe case, but the coloring of what was ejected with force was not like in the pic, linked above.