I used to work on an experimental farm for North Dakota State University. One of the joys I had was helping a graduate student take samples from the rumen of live cattle. We'd drive the cattle into a pen, pick out each one and run her into a chute. Then, we'd catch her in a squeeze chute. Once we had her caught, we'd unscrew the plug from the fistula sticking out of her side. I'd then have to stick my arm clear up to my armpit into the stinking, hot cavity of her rumen and dig most of the partially digested grass out. I'd put it in a clean trash can, then take a sub-sample and put it in a lidded container for later analysis. Then, I got to put all that mush back into the cow's rumen, turn her loose and go catch another one. By the time you've done 20 head or so of these, you are filthy from head to toe. Feet and legs covered in cow poo and mud. Torso on up to sometimes even the face with rumen fluid. Really nice. You can't even imagine how bad rumen fluid smells. I'd go home, strip down in the garage, wrap in a towel and take a very long shower every time I helped do that job. Even after lots of scrubbing with some pretty strong soap, I'd still smell like a rumen. The fluid stained my skin green, especially in cracks and under my fingernails for days. Before I helped do that job, I though pig poo was the worst smelling stuff on earth. Now, I know better.
If Mike wants a job that's really dirty, he should look up a research farm that does animal nutrition experiments in which they have to take samples from the rumen of cows like this. He'd love it.
