Luna Lovegood owns a pair of Dirigible plum-shaped earrings.

In 1995, when Harry Potter was being persecuted by the Ministry of Magic, Luna, while wearing these earrings, expressed her support in Harry. Harry privately wished that people who believed in him weren't also inclined to wear such strange and incredibly ridiculous accessories. When Parvati Patil and Lavender Brown laugh at the earrings, Luna mistook them to be laughing at her believing in Harry.

When Harry Potter, Ron Weasley, and Hermione Granger visited the Lovegoods' house in 1998, Harry noticed a bush covered in exceptionally strange and orange, radish-like fruit by the tree, with a sign saying "keep off the dirigible plums", and noted their striking resemblance to Luna's earrings.

Behind the scenes