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A chance so tiny it might as well be a fart in a tornado. No one is going to hear it, and even if they did, they wouldn’t care.
My chances of passing this test are a fart’s chance in a windtunnel.
He had a fart’s chance in a windtunnel of making it to the final round.
A fart’s chance in a windtunnel is what I had when I bet my last dollar on red.