Place it right after the confusing moment peaks, then follow it with Oh My God Wow for a bigger reaction, or put Ceeday Huh just before it to build the confusion in two steps.
Über diesen Sound
This is a very short Polish voice clip, lasting about a second and a half, in which a speaker blurts out 'Co to kurwa jest?' in a startled, incredulous tone. It gives a listener an instant hit of bewildered confusion, funny because the disbelief sounds completely genuine and unfiltered. It comes from a strange moment filmed at a rally in Poland.