Place it just before the fall in a fail edit, after Sudden Suspense builds the tension and before Cartoon Slip marks the impact, then let the reaction shot play out without another sound on top.
O tym dźwięku
This short spoken line, lasting under three seconds, delivers a deadpan wish for softer ground just before a fall. It feels awkwardly funny, the kind of dry, self-aware dread that lands when someone knows trouble is coming and cannot stop it. It comes from Animaniacs, in the episode Clown and Out.