hats
cursed hat, Sorting Hat
Howler
icicles, everlasting
Invisibility Cloak
jokes
keys
flying keys, seven-lock trunk keys. shrinking keys
lunascope
magical megaphone
Marauder's Map
mirrors
the Mirror of Erised, talking mirrors
Mrs. Skower's All-Purpose Magical Mess Remove

• The Sorting Hat
• Bill Weasley had a penfriend from Brazil who became upset when Bill couldn't travel all the way to South America for a visit, so this person send him a cursed hat which made his ears shrivel up. (

Howler
A Howler is a nasty letter sent to tell someone off. It arrives in a red envelope, smoking slightly. It must be opened immediately or it explodes. Upon opening, the Howler screams at the recipient in a voice magically magnified for maximum effect. Students at Hogwarts occasionally receive a Howler from their parents (Ron: CS6, Neville: PA14). Howlers were sent to the Ministry of Magic to complain about the "lax security" at the Quidditch World Cup. Percy had to deal with some of them. He said he had scorch marks all over his desk  (GF10). When Rita Skeeter wrote gossip about Hermione, some readers of Witch Weekly sent Hermione Howlers (GF28).

icicles, everlasting
SEE weather

Invisibility Cloak (SS12, CS14, GF35) Not unique, since Ron recognized it, but certainly rare. Harry inherited his from his father by way of Dumbledore. Harry's Invisibility Cloak is either quite large, big enough to cover several kids and a dragon in a wooden packing crate, or more likely it magically expands to cover what it needs to cover. Moody has one in his seven-lock trunk (second key) (GF35) Invisibility Cloaks are woven from the hair of the Demiguise (FB). They look like shining, silvery cloth and are "strange to the touch, like water woven into material." (SS12)

jokes
A number of jokes and gags are available at places like Zonko's Joke Shop in Hogsmeade. Students at Hogwarts are particularly good customers of Zonko's. Mr. Filch, the caretaker, wages a constant battle against the troublesome and annoying pranks that are played by boistrous students. He maintains a list of 437 forbidden items which are not allowed in the school.

• dungbombs - create a stink
• nose-biting teacups
• Fillibusters Fabulous Waterproof No-Heat Fireworks
• Screaming Yo-yos
• Fanged Frisbees
• Ever-Bashing Boomerangs

keys

• One of the chambers which had to be crossed to get to the hiding place of the Philosopher's Stone was filled with hundreds of bewitched, jewel-like flying keys. In order to pass out of the chamber, a person must find the key which fits the lock of the door on the far side. The correct key is an old-fashioned one, silver with bright blue wings. Several broomsticks are provided along the wall to be used to fly up and try to catch the right one.
• ring of keys for the seven locks on the seven-lock trunk
• Arthur Weasley found a few shrinking door keys on one of his nighttime raids. These keys are bewitched to shrink so their Muggle owners can't find them. When asked why anyone would make keys shrink, he explained:
"Just Muggle-baiting...Sell them a key that keeps shrinking to nothing so they can never find it when they need it...Of course, it's very hard to convict anyone because no Muggle would admit their key keeps shrinking--they'll insist they just keep losing it. Bless them, they'll go to any lengths to ignore magic, even if it's staring them in the face..." (CS

lunascope
Some kind of astronomical model or instrument which shows the phases of the moon. ("It’s a lunascope, old boy -- no more messing around with moon charts, see?") (PA4)

Marauder's Map Created during their years at Hogwarts by James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew, this is a magical map of Hogwarts castle. It shows the entire Hogwarts grounds, including seven secret passages out of Hogwarts and into Hogsmeade. The map also shows the location of people. It would seem that people only appear on the map if there is some reason for them to be there. A little miniscule figure of Harry only appeared once he gained possession of the map and needed to use it. The map magically shows the entire castle at once. The map looks like a large but empty piece of old parchment until it is activated with the words "I solemnly swear that I am up to no good." To clear the map, the phrase "Mischief managed" must be spoken.

mirrors

Mirror of Erised
A magnificent mirror, as high as a classroom ceiling, with an ornate gold frame, standing on two clawed feet. The inscription carved around the top reads "Erised stra ehru oyt ube cafru oyt on wohsi," which is "I show not your face but your heart's desire" written backwards. When you look into the mirror, you see the deepest, most desperate desire of your heart. The mirror has trapped people who can't bear to stop staring into it, unsure if what they see is going to actually happen. Harry sees his family in the Mirror; Ron sees himself as Head Boy and Quidditch champion.(SS12) 

Dumble describes the Mirror to Harry this way:

"It shows us nothing more or less than the deepest, most desperate desire of our hearts. You, who have never known your family, see them standing around you. Ronald Weasley, who has always been overshadowed by his brothers, sees himself standing alone, the best of all of them. However, this mirror will give us neither knowledge or truth. Men have wasted away before it, entranced by what they have seen, or been driven mad, not knowing if what it shows is real or even possible." (SS12)

Dumbledore uses the power of the Mirror to protect the Philosopher's Stone:

"It was one of my more brilliant ideas, and between you and me, that's saying something. You see, only one who wanted to find the Stone--find it, but not use it--would be able to get it, otherwise they'd just see themselves making gold or drinking Elixir of Life. My brain surprises even me sometimes..." (SS17)

Harry, who didn't want the Stone when he looked into the Mirror, suddenly found it in his pocket. (SS17)

mirror, talking

"Tuck your shirt in, scruffy!"
     -- the Weasely's talking mirror

The Weasleys have a talking mirror on the kitchen mantlepiece at The Burrow which, uh, aids in grooming (CS3).
There was also one in room 11 of the Leaky Cauldron when Harry stayed there which spoke in a wheezy voice. When he tried to flatten his unruly hair, it told him "You're fighting a losing battle there, dear." (PA4)

Foe Glass
Magical mirror which shows a person's enemies. SEE Dark Detectors.

magical megaphone

• used by Lee Jordan to give Quidditch play-by-play (PA15)
• large purple megaphone used by McGonagall when she called off the last Quidditch match in May of 1993. (CS
• c.f. Sonorus Charm