Back Door is a form of malicious feature in which the program is configured to respond to commands sent to it from the developer. A Universal Back Door is an ability of the developer to remotely change the program to do anything the developer desires it to do. Sometimes Universal Back Doors are called "Auto-Update".
This comment thread is for people to document various implementations of this malicious feature.
I don't think you think of Science Fiction often when thinking about Lars Von Trier. Yet, his 2011 masterpiece Melancholia is one of, if not the best, science fiction film(s) ever.