It aint over until…
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This three hundred and fifty pound woman shows up at a run-down circus, looking for a job as a flying trapeze artist.
The incredulous ringmaster gives her an audition, and is so impressed he tells her she's hired. There's one condition: she goes on last.
On opening night, the other acts are so bad, some of the spectators begin to leave. The ringmaster, seeing this, runs out and cries, "Don't go now, folks, the show aint over till the fat lady swings!"