What if you could date Siri?
That's kind of the question at hand in "Her," the new film written and directed by Spike Jonze. The movie, a trailer for which hit the Web on Wednesday, stars Joaquin Phoenix as Theodore Twombly, a lonely writer trying to recover from a failed relationship. When an advanced operating system comes on the market that creates tailor-made virtual companions, Theodore signs up. It's then that he meets "Samantha," an engaging female voice program that comes to win his heart.