Place it at the end of a setup clip, then follow it immediately with the shocked reaction and the laugh that follows, so the prank lands as a three-beat gag rather than a single isolated noise.
關於此聲音
This is a short, exaggerated fart sound lasting just over a second, played as one quick, cartoonish blast with no voice or music around it. It gives an instant gross-out laugh, the kind that lands best when everyone is already trying not to giggle, because the joke is obvious the moment it plays.