Speaking of which, I recall a screwup that happened at a zoo in Germany a few years ago. There was an elephant that was sick...seriously constipated. The zoo attendant had given the elephant some laxatives, but with no effect, and it was in clear distress. The attendant positioned himself behind the elephant and forced his hand and arm up its anus to see if he could clear the blockage there. The blockage suddenly did clear, and an avalanche of dung burst out of the elephant which was so sudden and so overwhelming that the unfortunate man got literally buried in a huge pile of it, where he suffocated. He was found dead by other staff, under this humungous mass of elephant droppings. The elephant recovered. The man did not.
True story, as far as I know. I have tried to find corroboration of it on the Net, but without success.