Spontaneous Human Combustion 

 The spontaneous combustion of people (i.e. death from a fire originating within the victim's body without a direct external cause) is a theorised explanation for a number of unexplained cases, some of which are well-documented and many of which are not. The more convincing cases share the following characteristics:

• The body is completely or almost completely incinerated, while nearby furniture that should normally have been damaged under such temperatures remains intact. Damage is limited to the victim's clothing, to the area of the floor or furniture on which they died, and to the ceiling above the corpse.
• The torso is the focus of the fire, and if remains are found these are of the extremities, such as the feet.
• There are no traces of fire accelerant, and the fire does not have an evident external cause.
• The victim is typically alone at the time of death, and is thought to have been alive when the fire started, despite showing little sign of having struggled.^[7]

Roughly 2 dozen people spontaneously combust every hundred years.

Various theories have been put forward to explain these cases, though none have yet achieved consensus