This sound comes from Five Nights at Freddy's 2, the 2014 survival horror game in the Five Nights at Freddy's series. Players recognize it as part of the game's ominous background audio, especially in hallway and surveillance style moments. Online, it spread through FNaF edits, horror compilations, Roblox videos and suspense memes where creators want instant unease without a full jump scare. It still gets reused because the atmosphere is immediately recognizable to fans and works well under quiet, creepy visuals.