If you love Harry Potter you should read this  
(spoiler alert)

Harry's birthday is July 31, 1980. J.K Rowling's birthday is also July 31 except in 1966.

The actress who played Moaning Myrtle was 37 years old. She was the oldest actor to play a Hogwarts student.

In the books, Ron Weasley was supposed to swear a lot but Rowling's publisher nixed it to be appropriate for younger readers.

Rowling's publisher suggested she use initials instead of her first name to appeal to male readers. Her name is Joanne, but there isn't any "K" in her name, though she chose that letter for her grandmother Kathleen.

Alan Rickman, the actor who played Snape, was the only one who knew his character would die before the Deathly Hollows came out because Rowling told him.

Rowling said her inspiration for the name Hogwarts came from a plant at a conservatory that she saw.

Rowling based Hermoine to be a little like her self. Hermoine's patronus is even Rowling's favorite animal, an otter.

Despite what many people think, the "T" at the end of Voldemort is silent. The name comes from the french words "flight of death."

Rowling was the first person to become a billionaire by writing books.

Rupert Grint, the actor who played Ron, dressed up as his female drama teacher and rapped about Ron Weasley for his audition tape. It began, "Hello, my name is Rupert Grint. I hope you don't think I stink."

Robbie Coltrane, the actor who played Hagrid, has gotten a minnie fan and a fruit bat stuck in his beard.

Sirius Black's tattoo idea came from Russian prison gangs. It identified some one to be feared and respected.

Tom Felton, the actor who played Draco Malfoy, actually auditioned for the role of Harry and Ron, but was chosen to play Malfoy instead.

During the scene of horcrux versions of Harry and Hermoine kissing, Rupert had to be removed from the set for laughing too much.

The flying car that they used in the movie was stolen off set and discovered 7 months later when an anonymous caller informed police of it's whereabouts.  

On one of the quidditch trophies, Professor McGonagall's name was listed. (On right.)

Tom Felton had to have the pockets of his Hogwart's robes sewed shut because he kept on trying to sneak food onto the set.

Alfonso Corone, who was the director of the movies, made Rupert, Daniel and Emma write about their characters so that he could understand them better. True to their characters, Emma turned in a 16 page essay, Daniel turned in a simple 1 page essay an Rupert never even turned his in.

40 versions of Salazar Slytherin's locket had to be made because of Daniel and Rupert's failed attempts during filming to destroy it properly.

At one time, the least successful Harry Potter film (The Prisoner of Azkaban) made 90 million dollars more than the most successful Twilight movie.

(That was my favorite fact!)