Eternal Sunshine of the Spotless Mind (2004)
Eternal Sunshine of the Spotless Mind is a 2004 American romantic science fiction dramedy film about an estranged couple who have each other erased from their memories, scripted by Charlie Kaufman and directed by Michel Gondry. The film uses elements of science fiction, psychological thriller, and a nonlinear narrative to explore the nature of memory and romantic love. It opened in North America on March 19, 2004, and grossed over $70 million worldwide.
More at Wikipedia.