Put it at the end of a failed attempt, after the mistake is fully visible, then follow it with Emotional Damage to escalate the reaction, or open with the Game Show Buzzer before the reveal and let this clip close the scene.
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This is a 1.2-second clip of a low male voice saying 'bruh' in a flat, drawn-out tone, with no music or other sound behind it. It lands as pure deadpan disbelief, the kind of tired, unimpressed reaction you give when a plan falls apart or someone states the obvious. The delivery makes it feel both funny and dismissive at once.