Two Friends discover to see man's ashes in bathroom, and all that were left were his feet. The man Exploded?

many of my friends deeply believe in this Unexplained Phenominon. the man was on the toilet at the time. im guessing it was some chemical reaction in his body that burnt him from the inside out very quickly. nothing else could've caused it. its very possible,what with all the nasty flammable things in the human body. theres even been hundereds of cases of people exploding like this because of the chemicals messing up in their bodies. some chemicals even produce oxygen when theyre mixing or reacting..there was even a case of a woman on a boat who was seen just exploding into flames for no reason without warning where she burnt to death...so this seems extremely plausable to me.. does anyone else agree?