BRO Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!
The chant that the Cthulhu cultists and the esoteric order of Dagon repeat, in the lovecraft mythos, when Cthulhu comes back, he'll kill everyone who doesn't chant in the language of the city R'lyeh that phrase. I don't know if I translated it correctly, but IK in spanish, in the Gou Tanabe manga adaptations it says "En su casa de R'lyeh, el fallecido Cthulhu espera soñando". Fhtagn means deceased.