Remembrall

A Remembrall is a hand-sized clear, glass ball that contains clear smoke that turns red when its holder has forgotten something. It then turns clear once whatever was forgotten is remembered.

Known Remembralls
Neville Longbottom received one as a gift from his Gran at the beginning of the 1991–1992 school year. As soon as he held the remembrall in his hand for the first time, it turned red indicating he had forgotten something, the problem was he could never remember what it was that he had forgotten.

Remembralls were also banned in the O.W.L.s because they would be used to cheat. They were banned in the examination hall, along with other items that could be used for cheating; such as an Auto-Answer Quill.

It was this object that propelled Harry Potter into his career as the Seeker for the Gryffindor Quidditch team. When Neville Longbottom accidentally flew into the air in his first flying class, he left it behind when he crashed and broke his wrist. Draco Malfoy took it and threw it high into the air. Harry Potter chased it and caught it just as it was about to smash on the ground. Professor McGonagall witnessed the event, and was convinced that Harry's natural affinity for flying would serve him well as Gryffindor's new Seeker.

Behind the Scenes

 * Remembralls are available for purchase at The Wizarding World of Harry Potter as a novelty toy.
 * In LEGO Harry Potter: Years 1-4, rather than merely taking Neville's remembrall up in the air and dropping it, Draco throws it to a pair of gargoyles, whom Harry then destroys while airborne. The ball then falls into the clutches of a giant flowered plant and Harry casts spells at the three flowers to make them launch the ball into the air. Only then does Harry make the airborne catch that he does in the novel.

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter and the Philosopher's Stone (film)
 * Harry Potter and the Philosopher's Stone (video game)
 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Order of the Phoenix (video game)
 * LEGO Harry Potter: Years 1-4
 * The Wizarding World of Harry Potter
 * Harry Potter Trading Card Game

Notes and references
Rapeltout Ricordella