Okay, I was just re-reading HP6, and I came across this description:
"the vulture-like countenance appeared round the corner... sunken cheeks, skin like parchment and long hooked nose illuminated unflatteringly" (p288 British edition. A few words missing.)
Now, is it just me, or does that sound very much like a description of Snape?
It's not. It's a description of Madam Pince, the librarian. And then I was thinking... Pince. Hmm, sounds rather like PRINCE, doesn't it? And what was Snape's mother's maiden name? Prince. Is there any relationship there, possibly?
I know, it's improbable. But if it turns out to be true, I suggested it, and if it doesn't, I never really believed it anyway :-P