Premise: Memento is a 2000 American neo-noir psychological thriller film directed and written by Christopher Nolan, and produced by Suzanne and Jennifer Todd. The film's script was based on a pitch by Jonathan Nolan, who later wrote the story "Memento Mori" from the concept. It stars Guy Pearce, Carrie-Anne Moss, and Joe Pantoliano.
Hypothesis: Memento's plot was dissatisfying to Jonathan Nolan, and this is why he wrote his story.