Place it just before the decision point in your edit, then follow it with the Oh My God meme as the reaction and finish with Bruh once the warning is ignored and the plan goes ahead anyway.
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This is a short Spanish voice clip of Melcochita saying 'No vayan', lasting about 1.3 seconds. His urgent delivery makes the warning feel playful and dramatic at once, like a friend stepping in just before a bad decision. It works as a comic stop sign for someone heading somewhere they should avoid.