Place it right after the mistake is shown, as the reply to the scene, then follow it with a short laugh to close the joke. Start an edit with WhatsApp Message Sound so the apology reads as an incoming voice note, then let this clip answer it.
关于此声音
This is a roughly 13-second voice note repeating the Bengali line 'please khoma kore dau,' meaning 'please forgive me,' in a soft, begging delivery. It feels awkward, sheepish and over-the-top apologetic, like someone caught in the act and trying to talk their way out of it. It works as an instant reaction because the remorse comes through even before the words are understood.