Put it at the peak of the visual gag, then follow with a bruh reaction for the person caught out, or switch to fart with reverb when the scene needs a bigger payoff, saving long brain fart for a later scene that keeps escalating.
关于此声音
This is a two-second fart effect built as one blunt burst of crude, over-the-top noise with no speech or music. It feels instantly silly and awkward, turning a serious or clumsy moment into a childish gag that needs no explanation. Because the sound is so direct, listeners get the joke at once and react before they have time to think about it.