Spirit boxes are tools from paranormal investigation that sweep radio frequencies, and games turned that crackly voice effect into a familiar horror cue. Short clips like this spread through gameplay videos, stream highlights and meme edits where a calm investigation suddenly turns hostile. The phrase works because it suggests a presence just out of view, similar in effect to a FNAF jumpscare scream but quieter and more unsettling. It remains popular for Halloween edits, horror compilations and prank sounds where timing matters more than volume.