Hahaha what
Granted. You spontaneously combust, but the flame does not burn you or anything near you. You quickly become a celebrity among the masses and the inability of modern science to explain your immolation causes most of the uninformed public to lose all faith in science. Society breaks down as the few “scientists” remaining are hunted down and killed, ushering in a new era of superstition and stagnation. You remain in a position of power as a god-figure among the general public, enjoying all the luxuries expected of such a position. In the meantime, undeveloped countries go about their daily struggles as normal, managing to find ways to permanently improve their lots in life after aid from wealthier countries is cut off.
Disgusted with the ignorance of the rest of the civilized world, the Belgians declare war on your country of residence. Having retained the advantage of technology, the 1st Belgian Expeditionary Force rapidly carves a nearly bloodless path through said country of residence with one goal in mind. While you are strolling through the palatial gardens, a Belgian sniper delivers a heavy-calibre round to your head. The fire, being purely cosmetic in nature, did nothing to save you.
Though the damage was done, humanity regains its former knowledge in a mere century. But your legacy remains, manifesting as inexplicable balls of flame that drift on air currents to eventually reach every last corner of the world. Scientists manage to isolate these balls of flame as individual molecules thought to have separated from your remains, yet how these molecules can give off a persistent cosmetic flame will never be known.
And from a high perch six dimensions away, a bearded figure laughs.
I wish I could read at a speed of over 9000 words per minute with a >90% retention rate.