Arthur Upfield was writing a novel in which a killer comes up with the perfect murder scenario. In short, the killer puts the corpse of his victim inside a dead cow's gut, and burns both of them at the same time. He removes any metal fragments, such as jewellery, belt buckles and teeth, dissolving them in acid, then smashes up...
One notable incident occurred in 1326, when a gong-farmer named Richard the Raker fell into a cesspit whose ceiling had rotted, and drowned while collecting feces....
An alleged ancient Persian method of execution mentioned by Plutarch in his Life of Artaxerxes. It ostensibly entailed trapping the victim between two boats, feeding and covering them with milk and honey, and allowing them to fester and be devoured by insects and other vermin over time.
Blood farms in different parts of the world impregnate horses and draw their blood for the hormone to be injected in other animals. The production of the hormone is increased if the animal is stressed. Videos from the notes might be age or region restricted, here is a invidious link: Iceland - Land of the 5,000 Blood Mares...