Place it right at the cut where the setup ends, so the reaction shot starts immediately after it. Follow it with a shocked sound for the first face in frame, then an oh no no no laugh to close the scene.
關於此聲音
This clip is a fart sound effect lasting just under eight seconds, centred on the unmistakable noise of flatulence. It feels silly, crude and deliberately immature, turning an awkward bodily noise into an instant laugh. The humour comes from the embarrassment of it, especially when it catches people off guard in a quiet moment.