An interested subject to research. I can't recall how many I've heard about over the years. Quite often it has been instigated by some minor cult figure and passed around that the world will end to their followers. At a guess, I'd say I've heard of a least half-a-dozen times where it's made the newspapers. And I expect there were other instances what were simply regarded as not worth publication.
But what does the end of the world mean anyway? Are we talking human habitation? All living things, including the insects, and bacteria? Are we talking about a world denuded of all flora - grass, trees, soil? Are we talking of a globe shattered into a million fragments to circle as a sort of asteroid belt around the sun? It's all very vague.