It's Just A Coincedence
...Or is it?
The Number 12
Book I:
Dumbledore uses his Put-Outer to extinguish the 12 street lamps on Privet Drive.
Dumbledore's watch has 12 hands.
On Friday, 12 letters arrive for Harry.
At midnight, Harry turns eleven and Hagrid bangs on the door to the hut on the rock.
Dumbledore is famous for discovering the 12 uses of Dragon's blood.
The troll Quirrel let in on Halloween was 12 feet tall.
During the flying lesson, it says Neville originally rises to 12 feet.
The Wizards Duel with Draco was supposed to happen at midnight.
Harry tells Neville he is worth 12 of Draco.
There are 12 Christmas trees in the Great Hall.
Quirrel gives in to someone in a classrom. After Quirrel leaves the room, Harry would bet 12 Sorcerors Stones that the other person in the room was Snape.
Shortly before the Harry, Hermione, and Ron leave to go through the trapdoor, Hermione says that she won't get expelled because she got 112% on Flitwick's exam.
Book II:
Harry turns 12 years old.
Dobby's Hover Charm was used at 9:12.
Ron says he wrote to Harry at least 12 times over the Summer, asking him to stay at the Burrow.
When Draco is complaining about Harry, Lucius cuts him off and says he's already heard this a dozen times already.
There are 12 school governers.
Lockhart says that in Chapter 12 of Wanderings with Werewolves, he divulges that his ideal birthday gift is to have peace among all creatures.
Lockhart says there are 12 dwarf cupids roaming around the school delivering Valentines.
Bill and Percy both got 12 O.W.L.s.
Book III:
Aunt Marge has 12 bulldogs.
Sirius was imprisoned at Azkaban for 12 years.
To get his mind off of Aunt Marge's insults, Harry tries to remember page 12 of his book: "A Charm to Cure Reluctant Reverses."
Harry's Nimbus 2000 was smashed into a dozen pieces.
Fudge says Black murdered 12 muggles and 1 wizard with a single curse.
At The Leaky Cauldron, Ron and Percy stay in room #12.
Buckbeak's wingspan is said to be 12 meters long.
Ron tells everyone when he woke, Sirius was standing over him with a 12 inch knife.
Sirius tells Harry he got him the Firebolt because of 12 birthdays without presents.
At the Christmas feast, Trelawney counts 12 people at the table and refuses to sit down because she would be thirteen.
McGonagall isn't happy when Harry asks about the status of his broom for the 12th time.
Sirius tells Lupin to hurry up with the explanation since he's been waiting 12 years to get back at Pettigrew.