You, me, and all living things on Earth will - some day - die. But some deaths are more gruesome than others.
Anna Gosline of New Scientist wrote a morbid yet fascinating article about what some of the worst ways to die feel (or technically, should feel) like. Take for instance, decaptiation:
Quick it may be, but consciousness is nevertheless believed to continue after the spinal chord is severed. A study in rats in 1991 found that it takes 2.7 seconds for the brain to consume the oxygen from the blood in the head; the equivalent figure for humans has been calculated at 7 seconds. Some macabre historical reports from post-revolutionary France cited movements of the eyes and mouth for 15 to 30 seconds after the blade struck, although these may have been post-mortem twitches and reflexes.