Nice one! I remember seeing a short video, from a comment in HN, that was brilliant and was taking the idea of self-reference and our universe being a simulation to the extreme. (Spoilers follow) It was inside a big prison cell, where a new inmate arrived and there was an older man holding a box that contained a duplicate of the cell, but with real (identical) people. Someone could interact and see the results on 2 different levels/realities! Anyone remembers or knows what I’m describing?