Place it near the end of a prank edit, after the setup has made viewers expect a serious payoff. Follow it with the shocked reaction, then let the embarrassed laughter take over before cutting to the next gag.
このサウンドについて
This is a long, drawn-out fart sound effect that builds and bursts like a cartoon bomb going off, lasting just over twelve seconds. It is crude, loud and deliberately over the top, made to catch people off guard and get an instant laugh. The gross-out humour lands best when everyone is expecting something serious and gets this instead.