In the book The Mind’s I by Douglas Hofstadter and Daniel Dennet, I read that at least some phsyologists (or whoever it is that studies this kind of thing) think that the anasthesia we use during surgery works, not by rendering you unconscious, but rather, by rendering you paralyzed and unable to form memories. So you experience it–but then don’t remember it afterwards. The unfortunate people we’re talking abotu in this thread would, then, be those who managed to form memories of something everyone experiences during surgery.
It brings up an interesting (admittedly IMHO-forum type) question. If you knew surgery really is like this–you knew that you would be conscious and fully cogniscent of the agony of bein cut into and having your insides rearranged–but you also knew you’d have no memory, not even unconscious, of the event, would you still be willing to undergo the process?