Joaquin Phoenix plays Theodore in his new movie Her, where he’s fallen in love with the perfect girl, Samantha (voiced by Scarlett Johansson), but she is a computer. In fact, my favorite part of this new trailer is when he tells Amy (played by Amy Adams) that he’s dating an operating system. Her reaction is great. Check out the trailer below.

Trailer: Her – Official #2

Her staring Joaquin Phoenix, Scarlett Johansson, Amy Adams, Rooney Mara and Chris Pratt is slated to hit theaters December 18th, 2013.