Harry Potter Facts!

Albus Dumbledore: The corpse of his sister Ariana Dumbledore.
Seamus Finnigan: A banshee.
Hermione Granger: Professor McGonagall telling her that she failed her exams or failure in general.
Neville Longbottom: Severus Snape.
Remus Lupin: Full moon.
Harry Potter: A Dementor.
Parvati Patil : A mummy.
Tom Marvolo Riddle: His own dead body.
Dean Thomas: Disembodied living hand.
Molly Weasley: Dead family/friends .
Ron Weasley: Giant spider (or any spider for that matter).
Padma Patil: A giant cobra.
Fred and George Weasley: Lord Voldemort.
Justin Finch-Fletchley: Lord Voldemort.
Dobby: Lord Voldemort.
Katie Bell: Lord Voldemort.

Source:

Harry Potter Wiki: Boggarts

Also: J. K. Rowling has stated hers would be the same as Molly Weasley’s: “her loved ones dead, or alternatively, herself buried alive.”

• Abstinence
• Balderdash
• Banana Fritters
• Baubles
• Caput Draconis (Latin for “Dragon’s Head”)
• Dilligrout
• Fairy Lights
• Flibbertigibbet
• Fortuna Major (Latin for “bigger luck”)
• Mimbulus Mimbletonia
• Oddsbodikins
• Pig Snout
• Quid Agis (Latin for “How are you”)
• Scurvy Cur
• Tapeworm
• Wattlebird

Source:

Harry Potter Wiki: Gryffindor Tower

Source:

Harry Potter Wiki: Hogwarts School of Witchcraft and Wizardry

Ordinary Wizarding Level Grading System:

• O = Outstanding (Pass, always continue to N.E.W.T.)
• E = Exceeds Expectations (Pass, almost always continues to N.E.W.T)
• A = Acceptable (Pass, rarely continue to N.E.W.T)
• P = Poor (Fail, may repeat subject)
• D = Dreadful (Fail, may not receive O.W.L. credit)
• T = Troll (Fail, with distinction. More than one T may mean refusal into other N.E.W.T.s)

The first three are passing grades, the last three are failing grades.

Source: 

http://harrypotter.wikia.com/wiki/Dudley_Dursley#Behind_the_scenes

Source:

http://www.accio-quote.org/articles/1999/0999-slj-feldman.htm
http://www.accio-quote.org/articles/2007/1224-pottercast-anelli.html

Source:

http://www.the-leaky-cauldron.org/2007/12/23/transcript-of-part-1-of-pottercast-s-jk-rowling-interview

Source:

http://news.bbc.co.uk/2/hi/entertainment/7649962.stm

Source:

http://www.accio-quote.org/articles/2000/1000-scholastic-chat.htm

Question: What position did James play on the Gryffindor Quidditch team? Was it seeker like Harry, or something different?

J.K. Rowlings: James was Chaser.

Source:

http://facts.randomhistory.com/2009/05/24_harry-potter.html

“Several publishers rejected the first Harry Potter manuscript saying it was too long and literary, but Bloomsbury Publisher finally accepted it in 1996. The book’s publisher suggested Rowling use the name “J. K.” rather than her real name “Joanne Rowling” to appeal to male readers. She took the “K” from her grandmother’s name Kathleen, but neither “Kathleen” nor “K” is part of her legal name.”

Source:

http://www.accio-quote.org/articles/2000/1100-macleans-bethune.html