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.
It is not often that a horror films appears to tickle the right nerves from the high-brow crowd of cinema critics. With 93% Rotten Tomatoes score though, it is safe to assume that Zach Cregger's Weapons from 2025 is one of those rare movies.