If you love films that make you philosophically question parallel realities and the meaning of memory, much like Donnie Darko, you'll love the romantic drama Eternal Sunshine of the Spotless Mind. Much like the Jake Gyllenhaal classic (minus the bunny, and with many more hair-colour changes), this movie centres on an estranged couple who have chosen to erase each other from their memories by way of a new procedure. Playing with the theme of time through a nonlinear narrative, this is a beautiful film you'll want to watch again and again.
Watch Eternal Sunshine of the Spotless Mind on Amazon.