The Forbidden Fountain of Oz food, which occurs most famously in the "forbidden fruit" of the Tree of Knowledge of Good and Evil in the Book of Genesis, but in other contexts too. The idea of water that purges the drinker's memory is also ancient. In Greek mythology it occurs as the river Lethe: the souls of the dead lose their memories of their earthly lives by drinking its water. The same idea can also be found in Eastern and other literatures, as in the "Well of the Waters of Forgetfulness" and other guises. "The 'Drink of Forgetfulness' is found in Greek, Hindu, Norse, and
Johnny and the Dead "The living must remember, and the dead must forget." The book is loosely based on real events in Westminster in the 1980s, when the council sold three cemeteries as building land for 15p (Pratchett was working as a journalist at this time). Part of the story deals with the last surviving member of the Blackbury pals, a Pals battalion with obvious parallel to the Accrington Pals. This gentleman is called Tommy Atkins, the name given to the generic British soldier of the day. A running joke in the book is that most of the Dead are "nearly famous", often being