Place it right after the mistake is shown, as the reaction that closes the scene, then follow it with the Awkward Moment sound to stretch the moment and the SpongeBob Disappointed sound to underline the letdown.
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This is a short Russian voice clip, about 1.8 seconds long, in which a woman delivers a mock-sympathetic insult, saying in effect that the listener is mentally slow and that she feels sorry for them, while making clear she does not share the problem. It lands as a smug, teasing put-down, funny because the sympathy is fake and the jab is direct.