SCP-066 comes from the SCP Foundation, the collaborative horror fiction universe where numbered anomalies are documented in clinical files. In the lore SCP-066 is a small, unpredictable object associated with Eric and with sudden, painfully loud sounds, which made it a natural fit for jumpscare edits. As SCP games, animations and readings spread on YouTube and TikTok, creators isolated the loud burst as a standalone scare effect, similar to the FNAF jumpscare scream used in gaming videos. It remains popular because the SCP name instantly signals creepypasta horror, even in a short meme clip.