Huh. As the poster of this, I actually made an explicit estimate to myself of how many points this would get. I thought I'd get just a few over the next day or two stopping at maybe 5 at most. Is this thread just upvote-happy and well-visited, or is there something in this that I should be doing more of?
Yes, I'm fishing for compliments. ;) Preferably useful ones, though...
This is a kind of "X files" thread.
Post experiences which spooked you, which made you doubt reality, mathematical or physical laws, your sanity, memory or perception. The more improbable the better, but no second-hand legends please, share only what you personally experienced. If you had the event later explained rationally please use rot13 to avoid spoilers.