Memento is a 2000 American neo-noir psychological thriller film directed by Christopher Nolan. The screenplay was written by Nolan based on his younger brother Jonathan Nolan's short story "Memento Mori". It stars Guy Pearce, Carrie-Anne Moss, and Joe Pantoliano. Memento is presented as two different sequences of scenes interspersed during the film: a series in black-and-white that is shown chronologically, and a series of color sequences shown in reverse order (simulating in the audience the mental state of the protagonist, who suffers from a anterograde amnesia). The two sequences "meet" at the end of the film, producing one complete and cohesive narrative.
Memento premiered on September 5, 2000, at the Venice International Film Festival and was released in European theaters starting in October 2000. It was acclaimed by critics, who praised its nonlinear narrative structure and motifs of memory, perception, grief, and self-deception. The film was successful at the box office and received numerous accolades, including Academy Award nominations for Best Original Screenplay and Best Film Editing. The film was subsequently ranked one of the best films of its decade by several critics and media outlets.
A memory inside a memory, Memento is a complicated head spinning adventure. Leonard is determined to avenge his wife's murder. However, unable to remember anything that happens day-to-day due to a condition he sustained, short term memory loss, he has to write himself note after note that still don't mean anything after he falls asleep.
The film goes back in time to reveal each little bit of the puzzle as he tries to find out the person who killed his wife and makes the audience feel just as confused as he is. The narrative closely follows a phone call Pearce has in which he talks about Sammy Jankis a former client of his who he believed had the same condition. The film takes an unexpected twist as the two characters have a lot more in common than is initially put across.