Place it right at the start of an entrance or reveal, then follow it with Goofy Ahh Sounds for a second wave before cutting to the reaction shot, and save Scream Meme for the moment the joke peaks later in the edit.
About this sound
This one-second clip is a single human voice chanting ooh wa ah ah ah in a rising, goofy cadence, with each syllable landing louder and sillier than the last. It feels playful and mockingly amazed, like a cartoon reaction to something unbelievable happening right in front of you, and it works best as a quick burst of disbelief rather than a serious sound effect.