Place it at the end of a setup line, just before the reveal, so the hint becomes the bridge to the next scene. Follow it with Awkward Crickets when the group gets no answer, then move to the payoff. For a bigger reaction, put a Shocking Sound Effect after the name is finally said.
このサウンドについて
A short voice clip lasting about two and a half seconds, built around a single spoken phrase, 'I know a', that stops before naming anything. It leaves the listener waiting for the name, place, or secret that should follow the words. It feels sly and confident, like a quiet claim to inside knowledge shared just before the reveal.