Spontaneous Human Combustion?
The idea that people can suddenly burst into flames for no apparent reason has been around for over a century; it even happened to a character in the 1853 Dickens novel "Bleak House."
Some sources claim that hundreds, or even thousands, of spontaneous combustion cases have been reported throughout history, though only about a dozen cases have been investigated.
There are many reasons to be skeptical that random people can spontaneously combust. Not only is there no plausible medical or physiological mechanism by which a person could generate enough heat to catch fire, but there exists no film or video evidence of it ever occurring.
With few exceptions, SHC cases follow a familiar pattern upon close investigation: elderly, young, or infirm people left alone in or near flammable materials and sources of ignition.
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Despite a lack of credible evidence for the existence of SHC, belief in the phenomenon is widespread, and every few years a suspected case makes the news. In fact in 2011 an Irish coroner even officially listed it as a cause of death in the case of a 76-year-old man found dead lying near an open fire.