Place it at the end of a failed-plan sequence, after the setup and just before the consequences unfold. Follow it with Windows XP Error Music for a tech mishap, or let Law and Order Dun Dun close a dramatic reveal.
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This is a short spoken 'Oh damn', delivered in a flat, resigned voice as a scheme collapses. It lands as dry, weary frustration rather than anger, the sound of someone realising a clever plan has failed at the worst moment. The line comes from the British television comedy Blackadder.