Place it after the visual punchline as the audience reaction, then follow it with a bruh for a deadpan contrast or the baby laughing meme to double down on the laughter theme in the same edit.
關於此聲音
This clip is a girl laughing hard with a repeated 'hahah' over about 15 seconds, going from giggles into full, breathless laughter. It gives a listener a silly, contagious feeling, like you are in on a joke you cannot unhear once it starts.