Call of Cthulhu takes its name from H. P. Lovecraft's 1928 short story and the long-running tabletop role-playing game first published in 1981, both centred on cosmic horror and fragile sanity. Short reaction clips tied to the franchise circulate on soundboards because the setting is built around characters witnessing things they cannot comprehend. An OMG exclamation fits that theme perfectly, so creators reuse it for Lovecraftian reveals, horror streams, and meme edits where a normal reaction feels too calm for what was just seen.