In an alternate universe, there is an idealized caricature of you. There are stories to explore in that idea. Of course, this could be too personal for some folks. Holding the mirror that close might not be comfortable. Now imagine a half-dozen of these characters, in fantasy situations.
Standing in line at the grocery store, gathering your snacks for the evening’s game, you see the tabloids. When you get home, the game is the world where those absurd headlines are the truth. No game supplements required. The storylines are already there: Bigfoot was my father, Hitler hid on secret moon base, Man cuts off own head with chainsaw and lives, etc.
A random group of friends discover that their proximity and will generate odd events. Individually, nobody has any powers, but whenever 2 or more people work together, there are powerful effects. Are these easily mapped by trial and error? Or do they vary so much that the only sure factor is the individual actors who participate?
A miraculously powerful being comes to Earth, and decides that art is better than reality. We are all overcome by the being’s projection of paintings, film, sculpture, magazine, and other media, such that they overwrite the world in a kaleidoscope of imagination. With so many possible competing realities at play, some degree of chaos is inevitable.
There is a small town called Dunbar. It has 150 people in it. Theories state this is the upper limit of the average human’s ability to maintain social contact with their brethren. There is nothing beyond this town. It is all that exists. What sort of stories come from that?