Place it at the exact beat where a plan gets rejected in your edit, then follow the pause with a fail sound meme button for the aftermath, or lead into it with a bruh meme button as the first reaction.
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A short male voice clip lasting just over a second says 'Nije moguce,' Serbian for it's not possible, with a flat, disbelieving delivery. It feels funny and incredulous, like an instant shutdown of an absurd idea. The line comes from the Serbian film Ivkova slava.