Place it right after the failed reveal, then follow it with Bruh Meme for a second reaction, or lead into it with Fail Sound Meme so the judgement lands after the mistake is clear.
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This is a 1.6-second spoken line in which a voice states flatly that something is caca, a blunt dismissal of whatever has just appeared. It feels dry and unimpressed, with a deadpan disgust that makes a worthless reveal funnier because the speaker barely reacts. The line comes from the film Prince of Darkness.