Place this clip right after the baffling line in your edit, then follow it with a funny ha ha laugh sound to release the tension, or end on a yeah reaction sound if the confusion turns into agreement.
Über diesen Sound
This clip is a short voice recording, just under six seconds, of someone saying the German phrase was bitte was in a baffled tone. It captures that stunned moment when something makes no sense at all, turning confusion into a funny, exaggerated reaction that listeners instantly recognise as disbelief rather than a real question.