SCP-173 originated as the first SCP Foundation article in 2007, a concrete statue that cannot move while watched but attacks when line of sight breaks. It became the face of the 2012 horror game SCP - Containment Breach, where the neck snap marked its kills and taught players to manage blinking. The clip spread through Let's Play videos, SCP fan games and horror memes, and the isolated snap is now reused far beyond the game as a shorthand for an unseen threat striking instantly.