Patented Daydream Charm was a magical item created by Fred and George Weasley, and sold at their shop in Diagon Alley, Weasleys' Wizard Wheezes. Virtually undetectable, they produce a very realistic daydream lasting for thirty minutes. Side effects may include drooling and/or dazed expression. They were not sold to customers under the age of sixteen, and like all Weasleys' Wizard Wheezes products, they were strictly banned from Hogwarts School of Witchcraft and Wizardry.