Place it immediately after the reveal or punchline, then follow it with a buzzer for a wrong guess or a cheer for a win, keeping the reaction as the centre of the sequence. Pair it with a short laugh when the surprise is funny, and let the next line of dialogue follow the reaction.
このサウンドについて
This is a short spoken exclamation built around a single drawn-out 'wao', delivered in a bright, startled voice that rises and falls in just over a second and a half. It lands as pure surprise, the kind of quick, amused disbelief you reach for when something is unexpected, impressive, or a little absurd. Its brevity keeps the reaction immediate and easy to repeat.