In 1991, Harry Potter saw a barrel of them at Slug & Jiggers Apothecary in Diagon Alley, priced at five Knuts a scoop. In 1994, there were some beetle eyes among the squalor in the Shrieking Shack. Later that year, some got scattered on the floor of the Dursleys' living room when the Weasleys accidentally broke down the wall.