Scenario idea for Call of Cthulhu:
"I think we're property.
...That once upon a time, this earth was No-man's Land, that other worlds explored and colonized here, and fought among themselves for possession, but that now it's owned by something:
That something owns this earth--all others warned off.
Nothing in our own times--perhaps--because I am thinking of certain notes I have--has ever appeared upon this earth, from somewhere else, so openly as Columbus landed upon San Salvador, or as Hudson sailed up his river. but as to surreptitious visits to this earth, in recet times, or as to emissaries, perhaps, from other worlds, or voyagers who have shown every indication of intent to evade and avoid, we shall have data as convincing as our data of oil or coal-burning aerial super-constructions.
...I suspect that, after all, we're useful--that among contesting claimants, adjustment has occurred, or that something now has a legal right to us, by force, or by having paid out analogues of beads for us to former, more primitive, owners of us--all others warned off--that all this has been known, perhaps for ages, to certain ones upon this earth, a cult or order, members of which function like bellwethers to the rest of us, or as superior slaves or overseers, directing us in accodance with instructions received--from Somewhere else--in our mysterious usefulness.
But I accept that, in the past, before proprietorship was established, inhabitants of other worlds have--dropped here, hopped here, wafted, sailed, flown, motored--walked here, for all I know--been pulled here, been pushed...have visited periodically for hunting, trading, replenishing harems, mining: have been unable to stay here, have established colonies here, have been lost here; far-advanced peoples, or things, and primitive peoples or whatever they were: white ones, black ones, yellow ones--
I have very convincing datum that the ancient Britons were blue ones..."
- Charles Fort, The Book of The Damned