[halfcat]

Wildly speculative unfounded thought experiment plot twist based on no evidence:

Neanderthals were the superior species and hunted humans into hiding. A global cataclysm occurred, devastating the food supply available to Neanderthals who required more fuel. Humans survived, only barely, because the few who survived on the run had acclimated to living in underground caves.

Sometime in the next few centuries, another cataclysm will occur, wiping out the surface dwelling human species.

Dolphins inherit the earth, and one day look back at the “primitive human species” that clearly gave way to the “superior” dolphin.

The end.

[Anotheroneagain]

How about this one: People started doing something that made their faces grow poorly, and they never stopped, in fact it got adopted universally.

[jassyr]

Ha, that took an unexpected but interesting twist!