Roald Dahl was someone whom the Twelfth Doctor claimed had an even darker sense of humor than himself, only on Tuesdays and Thursdays. (COMIC: The Hyperion Empire)
Behind the scenes
Among works by Dahl is Charlie and the Chocolate Factory.
Cardiff-born Roald Dahl is of course the namesake of Roald Dahl Plass, a major location in the Doctor Who universe as the location of the Cardiff Rift.