Of the Spontaneous Human variety.
I spent way too many hours worrying about bursting into flames when I was a kid. And I blame that photo. And that foot. Over the years I always kept an ear out for any proof that there's simply no such thing. That these people were human wicks and their body fat enabled their bodies to burn holes through floors and leave the rest of the room or house undamaged. But nothing ever seemed entirely persuasive.