yes ive no idea where it comes from, though ive learnt it from watching the american films with will smith etc, another one is the phrase, its not over till the fat lady sings! very strange.
i think this probably come from the old cabaret style stage shows* where the last act of the night was traditonaly the fat lady?? but there are many other phrases to say its not over till its over.
*this is a pure guess btw
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Count Zero - Creator of the Statistical Tennis Extrapolation & Verification ENtity or, as we like to call him, that steven.
I have always understood "not all over until the fat lady sings" was in reference to operas, operatic sopranos and contraltos being renouned for being on the buxom side. So, the end of the opera.