The Fungi From Yuggoth
(mug shot)
I saw the body spread on that dank stone, and knew those things which feasted were not men; I knew this strange, grey world was not my own, but Yuggoth, past the starry voids--and then the body shrieked at me with a dead cry, and all too late I knew that it was I!
H.P. Lovecraft, The Fungi From Yuggoth: IV. Recognition (1936)