This sound comes from Five Nights at Freddy's 2, the 2014 horror game by Scott Cawthon. Players know it as the Puppet or Marionette music box theme, a key audio cue tied to winding the music box mechanic in the Prize Corner. The melody became memorable because hearing it meant danger was building if the box was neglected. Online, it spread through FNAF videos, horror compilations, and creepy gaming edits, and it still shows up whenever creators want instant suspense with a recognizable game reference.