Place this clip early in a horror sequence as the detection cue, then follow the reveal with the FNAF jumpscare scream for the payoff. For a longer chase build, layer the danger alarm sound effect underneath afterward and end the segment before adding any comedy sounds.
About this sound
A very short voice clip of SCP-049, the Plague Doctor, calmly saying 'I hear you breathing' in a low, clinical tone. Lasting just over two seconds, it feels quietly terrifying rather than loud, turning a simple detection line into pure dread and making listeners feel exposed, hunted, and caught hiding where they thought they were safe.