“A vicious circle of incompatibility”

A fun 16-minute video from PortalRunner with this premise: This is an image file, containing a picture of my cat. But if I rename it to .MP4, it becomes a video file – also of my cat. If rename to .PDF, it becomes a text document containing the script for this video. It can also be a valid webpage, a .ZIP archive, or a PowerPoint presentation, all by simply changing the name. This kind of file is…