and returns to normal. U-No-Poo causes the consumer to have constipation, or as Fred and George refer to it: "The constipation sensation that's gripping the nation." Its name is a play on "You-Know-Who", commonly used to refer to Voldemort. Extendable Ears are long flesh-coloured strings, one end of which is inserted into a user's ear and the other end placed further away towards a conversation or sound. Much like a listening device, the user will be able to hear the sounds as if they were much closer to the source. They were first introduced by Fred and George Weasley in Harry Potter and the Order of the Phoenix, when they used the ears to listen to the Order's meetings, until one was destroyed (and eaten) by Crookshanks. Portable Swamps are, as the name suggests, realistic pop-up swamps. They were first seen in Order of the Phoenix after Umbridge is named Headmistress. Fred and George set one off in a corridor, partly as a distraction for Umbridge so Harry can use her fireplace, and partly to just cause general mayhem. They seem to be reasonably difficult to remove: Umbridge cannot remove it and forces Filch to punt students across, while Professor Flitwick vanishes it almost instantly later on in the novel. (He leaves a small patch untouched as a tribute to Fred and George, who have left Hogwarts by this point.) Decoy Detonators are described as black horn type objects that will run out of sight, and make a noise giving the user a good distraction. Introduced in Harry Potter and the Half-Blood Prince. First used by Harry while breaking into Dolores Umbridge's office at the Ministry of Magic in Harry Potter and the Deathly Hallows. Guaranteed Ten-Second Pimple Vanisher Pygmy Puffs (miniature Puffskeins) Edible Dark Marks There are also prank items which the Weasleys import from elsewhere, such as: Peruvian Instant Darkness Powder, which throws an area into darkness that cannot be penetrated by wand light or any magical means, although the effect wears off in a few minutes. Draco Malfoy uses it to avoid members of Dumbledore's Army in Half-Blood Prince. It is also used in the Half-Blood Prince film by Harry in order to gain access to the luggage space above Draco Malfoy's table on the Hogwarts Express. Zonko's Joke Shop Zonko's Joke Shop was a favorite place for Hogwarts students to shop on Hogsmeade trips. It carried