Put it just before the twist is explained, then follow it with the Funny Ha Ha Laugh Sound once the joke is clear, and save the Yeah Reaction Sound for a later agreement that confirms the confusion was justified.
关于此声音
This is a brief Vietnamese voice clip, lasting just under four seconds, in which a speaker asks what do you mean with the stress falling on the last word. The delivery is clear and steady instead of loud, so the question sounds like a pause after unexpected news. It feels puzzled and disbelieving, turning confusion into a readable reaction that works even for listeners who do not speak Vietnamese.