Place it at the end of a confused exchange in an edit, after a Ceeday Huh for the first beat of disbelief, then follow it with No No Wait Wait when someone tries to explain again and the scene needs a second reaction.
关于此声音
This is a roughly seven-second clip built around the German phrase versteh nur bahnhof, an idiom used when someone understands absolutely nothing of what was just said. It gives a listener a feeling of complete, comic bewilderment, like the words went past without landing at all, making the confusion itself the reaction.