Spontaneous human combustion

Spontaneous Human Combustion (SHC) is a name used to describe alleged cases of the burning of a living human body without an apparent external source of ignition. While there have been about 200 cited cases worldwide over a period of around 300 years, most of the alleged cases are characterized by the lack of a thorough investigation, or rely heavily on hearsay and oral testimony. In many of the more recent cases, where photographic evidence is available, it is alleged that there was an external source of heat present, and nothing occurred "spontaneously."

Yeah, okay, fine. The Human Torch spontaneously combusts all the damn time. Its his super-power for frick's sake!

Comics

 * Spirits of Vengeance 1