unauthorised Portkey." Any object can be used as a Portkey. As a safety measure to discourage unsuspecting Muggles from picking them up and activating them, wizards are advised to use old, worthless items. Portkey objects used in the Potter series include a football and an old Wellington [boot]. Once the Portus charm is cast upon an object, it glows blue and vibrates gently; once settled it has become a Portkey. When Portkeys are activated, users feel the sensation of a hook being jerked from behind their navel. The floor disappears from beneath their feet, leaving their last position behind them, and they fly forward through a whirlwind of colour and sound, appearing suddenly at their destination. With enough practice it is possible to achieve a graceful landing: After the Portkey trip to the Quidditch World Cup in the fourth film, Mr. Weasley, Cedric and Amos Diggory land on their feet, while the less experienced teenagers, including Harry, fall on the ground. A Portkey plays an important role later in the climax of Harry Potter and the Goblet of Fire. At the end of the Triwizard Tournament, the Triwizard Cup is revealed to have been turned into a Portkey by Barty Crouch Jr. to transport Harry and Cedric to a graveyard, where Cedric is killed and Voldemort regains physical form. Prompted by his parents, Harry later uses the Portkey to escape with Cedric's body back to Hogwarts. Sirius Black's Enchanted Motorbike Sirius Black owned a flying motorbike, which he lent to Hagrid the night Harry's parents died. It is first seen when Hagrid delivers the baby Harry to Number 4, Privet Drive in the first book, and then again when Hagrid uses it to transport Harry to a safe house in the seventh volume. In Deathly Hallows, various modifications have been made to the bike by Mr. Weasley, allowing it to create a brick wall or a net that erupts from the exhaust pipe and to shoot dragon fire from the exhaust, impelling the bike's sudden acceleration. The dragon-fire feature is used to great effect by Hagrid and Harry when being chased by Voldemort; however, Mr. Weasley did warn that he was unsure of its safety and that they should use it only in an emergency. He was right to say this, as the sidecar of the motorbike, unaffected by Hagrid's magic, dislodged after the abrupt acceleration. The bike is severely