SCP-049, known as the Plague Doctor, comes from the SCP Foundation, a long-running collaborative horror fiction project, and became widely known through the indie game SCP Containment Breach from 2012. In the game he speaks in a calm, courteous voice while pursuing the player, which made his polite lines iconic among horror fans. The greeting circulates in SCP memes, TikTok edits and YouTube compilations, often placed alongside other horror game staples like the FNAF jump scare scream and tense enemy spotted alerts.