Shane Carruth makes films that are impossible to explain. Well, his directorial debut (also his acting debut, and writing, and producing, and musical, and catering, and) Primer is the realistic time travel movie, but wrapping your head around the plot of that film takes at least three viewings and a flow chart. Never mind the science of time travel. His second film, meanwhile, managed to be almost inexplicable in both content and form, so thats nice. Upstream Colour stars Carruth and Amy Seimtez as two people who find themselves drawn to each other after a series of bizarre, hallucinatory out-of-body experiences and fugue states that may have been caused by a weird parasite thing. Thats a very bad way of describing it, but Upstream Colour is one of those just watch it sort of films. Nothing anybody can say will really sell you on it, just know that its one of the most unique, original and thought-provoking films of the decade. And its beautiful. And weird. And definitely science fiction because nanomachines are involved.