Place it after the reveal shot and before the reaction close-up, then follow it with a bruh soundboard button for the letdown or stack an emotional damage sound button right behind it when the pointed-out mistake costs the character.
About this sound
An eight-second voice clip of someone exclaiming the Russian profanity 'tam blia' in a frustrated outburst. The delivery is blunt and exasperated, turning a simple swear into a reaction that feels annoyed, dismissive and darkly funny when played out of context.