Many years ago I had this KOWAI dream.
I was hanging out with a few of my friends + my brother at a mall-type building. I turn around for a second and the chatter of our conversation had vanished with an echo; I turn around to face them only to find them gone. In their absence, day had become night and the mall itself had only a few dim lights in its complex.
Inexplicably I had a flashlight in my hand, so I wandered around for what was probably 3-5 dream hours. In the corner of my vision—or whenever I turned a corner—I could see something scurrying away from my line of site; The few times I went to investigate there would be no trace of what had fled. I would also constantly hear something following me. I never looked back.
I woke up from that nightmare in an unfamiliar bedroom. I sauntered out of that bedroom and went downstairs only to find nobody. The house I found myself in was a standard 2-story suburban house, except it was in the literal middle of nowhere; I can't exactly remember what was beyond the building's premises, but it might have been flat, arid ground that went on forever. Connected to the driveway was a road that stretched on for who knows how long. And there was no car. I don't remember what happened after that, but I woke up forrealzies drenched in sweat.
I've unfortunately never been able to lucid dream, but if I could I would want to freely explore both areas of this dream. The house especially. It'd be like playing those Gmod house maps.

Your fortune: You have cancer