In an edit, put it immediately after the confusing line or screenshot, then follow it with the awkward crickets sound button to let the moment hang. For a bigger reaction chain, end with the shocking sound effect button instead.
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The clip is a single spoken reaction lasting under a second, a voice blurting out 'Haa apa?' in a startled, questioning tone. It lands as pure confusion, funny because the bafflement is instant and exaggerated, like hearing something so unexpected or nonsensical that the brain stalls and all that comes out is a bewildered what.