SCP-173 is one of the most well-known entries from the SCP Foundation, a collaborative online horror fiction project that became especially popular through fan videos, readings, and games. Sounds built around spotting SCP-173 spread in horror edits because the character is instantly recognizable and associated with sudden danger when seen on camera. The clip stays useful in memes and gaming posts because the phrase is short, clear, and easy to sync to a reveal or panic moment.