Place it right before a reveal in your edit, then follow it with the FNAF Jumpscare Scream for the payoff, or precede it with the Danger Alarm Meme Sound to build pressure before it lands.
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This is SCP-049, the Plague Doctor, calmly saying 'I am the cure' in a deep, measured, slightly distorted voice over about two seconds. The lack of anger makes it feel unsettling and darkly funny, like a threat delivered as a diagnosis. The line comes from the SCP Foundation collaborative project and the character popularised by SCP Containment Breach.