Imagine science could take any man and woman... (Take an actor and an actress with absolutely nothing in common... say a gorgeous intelligent blond like Scarlett Johansson who picks up a homeless bum (Woody Harrelson) and imagine science could take these two and make them 100% compatible... emotionally identical doubles of each other. A visit to a futuristic clinic with a 90 day "satisfaction guarantee"... a few synthetic hormones and a blast of pheromones and an electrical impulse to synchronize their pituitary glands and they fall head over heals in love... 100% compatible... they listen to the same music, eat the same things, finish each other's sentences, and have endless sex day after day until they have lost all traces of their original selves. But then it happens... they no longer debate anything... they stop talking because they already know each other's answers and on the 90th day, they race back to the clinic to go back to being their original selves... but (because I like a happy ending...) they choose to stay together and fall in love in a healthy old fashioned way. The movie closes with the clinic, bordering on bankruptcy, advertising a 30 day "satisfaction guarantee"...