"Das Leben der Anderen/ The lives of others", directed by Florian Henckel von Donnersmarck

The horrifying, sometimes unintentionally funny system of observation in the former East Germany. In the early 1980s, the successful dramatist Georg Dreyman and his longtime companion Christa-Maria Sieland, a popular actress, are big intellectual stars in the socialist state, although they secretly don't always think loyal to the party line. One day, the Minister of Culture becomes interested in Christa, so the secret service agent Wiesler is instructed to observe and sound out the couple, but their life fascinates him more and more... Written by fippi2000
Source: imdb.com

My opinion: wow... what can I say ? ... I mean... that's a fantastic legacy of some dark period of Germany. It is really a great movie.