the Fat Lady

[dublinaaireland]

No: HPFGUIDX 74614

I was just watching a show called Hamish Macbeth (Scottish show first 
aired around the late 90's), and one character said, '...it ain't 
*over* till the fat lady sings!', and it made me ask the question, 
does the fat lady in the picture frame sing?? I can't remember and am 
about to scan through 5 books. I've just completed a search and 
couldnt find anything relating to this on HP4GU...Has it been 
mentioned before??
D