When recording the book, Fry had trouble saying the words "pocketed it." Through a bizarre speech impediment, it always came out as "pocketeded it." So he called her up and asked if he could change it. Rowling gave a hard no. And then, through sheer coincidence, the phrase "pocketed it," appeared in the next four Harry Potter books. That's how ridiculous this woman was willing to get for the tiniest amount of revenge.
Which brings us to the character of Gilderoy Lockhart, the blowhard teacher from Chamber Of Secrets. He was based on a man Rowling knew and despised, who was constantly bragging about things that almost certainly never happened. So she made him a character in her book who nearly helps Magic Hitler rise to power and gets his brain wiped. Then, after publicly announcing that this shithead was based on a real guy, Rowling said, "Don't worry ... he will never in a million years dream that he is Gilderoy Lockhart." So everyone who has ever met J.K. Rowling, take note: There's a decent chance she thinks you're a stupid asshole.
Warner Brothers Pictures
Based on a real stupid asshole.