Put this clip right after the line that causes the confusion, before any explanation starts. Follow it with a huh sound for a second confused voice, or swap in an oh my god wow reaction when you want a bigger surprise reaction from the next person on screen.
关于此声音
This one-second clip is a Minion stretching the word what into a squeaky, high-pitched whaaaat that rises like a question. It feels cheerfully bewildered, turning confusion into something light and silly rather than annoyed. The voice comes from the Minions, the yellow helpers in the Despicable Me franchise known for their playful gibberish delivery.