The Hounds of Tindalos

[...]In an awful light that was not light, in a silence that shrieked, I saw them. 

"All the evil in the universe was concentrated in their lean, hungry bodies. Or had they bodies? I saw

them only for a moment; I cannot be certain. But I heard them breathe. Indescribably for a moment I

felt their breath upon my face. They turned toward me and I fled screaming. In a single moment I fled

screaming through time. I fled down quintillions of years."[...]

                                                                                 "The hounds of Tindalos". H.P. Lovecraft