“So this Flamel bloke found the Stone-” said Ron.Apparently this plot line was cut from the final book. Man-oh-man, what I wouldn't give to have access to all her notes on the series...
“No - he made it,” said Harry. “He was an alchemist, which means-“
“Someone who turns base metals into gold,” said Hermione. She had that old proving-I-know-more-than-everyone-else look on her face, the other two noticed, “Of course. I read about this in ‘Alchemy, Ancient Art and Science’ by Argo Pyrites-“
“I missed that one myself,” muttered Ron.
“-Of course, it’s some of the most difficult magic you can do, and you end up not just with pure gold but with a funny stone thing-“
“Which is what I’m on about,” said Harry “The Philosopher’s Stone, yes. And it works, too. It kept Nicolas Flamel and his wife alive for about five hundred years.
“I know,” said Harry “But it’s true. He was spotted at the opera in Paris in 1762 and he was born back in 13 something.”
“But he’s dead now?” he asked.
“Of course,” said Harry. “Someone stole his Stone so he couldn’t make any more Elixir of Life, could he? It takes a while to make another Stone and by that time, I suppose he was just too old to live without his Elixir until a new Stone was ready. And now I’ll tell you something else really weird that I haven’t told you up to now - the Stone was found in my parents’ safe at Gringott’s bank.”
But instead of the interested noises Harry had expected, Ron and Hermione simply stared at him.
“What?” said Harry.
Ron cleared his throat, opened his mouth to speak but shut it again.
”What?” Harry said.
“Well, Harry,” said Hermione “I mean…”
“You mean what?”
He stared at them both as they shuffled their feet and tried not to look him in the eye.
“You don’t think,” he said suddenly and angrily “That my parents stole the Stone?”
“Um…” said Ron.
“Look,” said Harry furiously “That’s like saying they murdered Flamel…”
“Oh Harry, we never thought…”
“Not much, you didn’t,” said Harry “I don’t know how it got in there, but the Stone wasn’t put there by them…”
“Right,” said Ron quickly. “I’m sure you’re right.”
“There must be an obvious explanation,” said Hermione.
Harry wasn’t at all convinced that they meant it, but at that moment the bell rang which put an end to the conversation.
This was found on JKRowling.com. On the broken phone dail 62442 and press call and you'll find this easter egg.
Source [Everything Harry Potter]