Place it at the turning point of an edit, just after the setup and before the reaction shot lands. Follow it with the Bruh sound effect for a deadpan response, or open with the game show buzzer when the moment is a clear fail, then let it close the beat.
About this sound
Chak is a very short meme sound effect lasting about two seconds, made as a single sudden burst with no words or melody. It arrives all at once and stops just as fast, pulling eyes back to the screen. The feeling is sudden surprise mixed with awkwardness, the kind of jolt that underlines a failed moment or a reveal without taking over the scene.