Place it as the closing beat of a short edit, right after the action resolves and before your end card. Build up with a laugh track moment, then switch to this as the sign-off, or follow the blackout with Hello Darkness My Old Friend for a second ending tag that stretches the joke.
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This is a seven-second musical clip built around the repeated Portuguese chant 'apaga luz, apaga tudo' — turn off the light, turn off everything — sung in a catchy, insistent hook. It feels playful and theatrically final, like a joke blackout cue that turns a small moment into a dramatic lights-out ending for the scene.