SCP-173 is one of the best-known creatures in the SCP Foundation fandom, famous for moving when nobody is looking and for sudden lethal attacks. Short crack sounds tied to SCP-173 became common in fan videos, game clips, and horror memes because they instantly suggest that attack without needing dialogue. The effect stays popular in edits thanks to its speed and clarity, similar to how a metal pipe clang is used as an immediate punchline or shock cue.