Place it right after your reveal shot in the edit, preceded by sudden suspense to build the pause, then follow it with a huh reaction or a stunned oh my god wow for the response beat.
Über diesen Sound
A short voice clip, about a second and a half long, speaking the German question 'Wer bist du?' in clear, direct words. It gives a listener a mix of confusion and confrontation, like being caught off guard by a stranger demanding an introduction without any small talk or explanation first.