Is spontaneous human combustion real?

I’ve been reading about some cases on spontaneous human combustion and it’s incredibly strange. There are theories on this occurance but it seems like we’re still unsure on how or why it happens. The strangest part about the whole thing is that the flames that burn the body are very localized, they destroy most of the body but leave objects in close proximity to the person relatively unburned. Does anyone have any insight into this strange phenomena?