Place this clip right on the reveal in your edit, after the setup has played out cleanly. Follow it with the Oh My God Meme Sound for a second shocked layer, or precede it with the Emotional Damage Meme Sound when the blunder needs building first.
About this sound
This is a short Spanish voice clip, just under four seconds, of a speaker blurting out “anda el diablo, Dios mío” in a rushed, startled burst. The delivery feels overwhelmed rather than performed, which gives listeners an instant hit of disbelief mixed with comic alarm and amused confusion at something spiralling out of control.