Place this clip at the turning point of an edit, after a light, cheerful moment and before the scare, then follow it with the FNAF Jumpscare Scream for the reveal and the Inception Horn Sound Effect as the scene cuts to black.
About this sound
This nine-second clip is Wenda's corrupted phase-two theme from Sprunki Retake, a tense looping melody with a hollowed-out vocal and a slow, dragging rhythm. It feels sweet at first, then quietly wrong, building dread instead of shouting it. The sound comes from the fan-made Incredibox mod's horror phase, where its cheerful singers turn distorted and threatening.