Why on Earth? Painful death
According to medical science and what we already know, what is generally agreed to be the most painful way to die?
This is another of those questions for which there's no simple answer. But it’s a safe bet that the most painful way to die is going to be one that takes a very long time.
Broadly, death at the hands of a really imaginative torturer, who knows about things such as the amount of pain the body can stand before lapsing into unconsciousness, would be as hideously unpleasant as just about anything you can imagine. The Chinese had a method of execution known as the Death of a Thousand Cuts, which was just as you might imagine it to be, and was notoriously excruciating. They were also responsible for such imaginative ideas as tying a condemned man, legs spreadeagled, over a clump of fast-growing, sharpened bamboo stalks. These would gradually impale the victim, anus-first, over a period of days or even weeks, so he might survive appalling agonies so long as he was kept fed and watered during that time. And even in the clod-hopping and unsophisticated west, you can bet that such mediaeval favourites as boiling people alive in a cauldron of oil suspended over a slow fire would have been less than wholly pain-free.