For a while now I’ve thought that there should be a name for the following phenomenon. You think of something. And then you immediately realize that someone else has to have already thought of that very thing.
For example. A friend asked me what my Halloween costume is going to be. And I jokingly said that I was going to go as the octopus that was deleted from The Goonies. And that alone might be an example of this phenomenon, although it’s not the best example. But my next thought was: I said, “No, I’ll dress up as a businessperson, but I’ll have eight arms, and I’ll wear a pin that says, ‘OCTOPI WALL STREET.'”
And I knew at once that somebody else has already thought of that (the pun, if not the precise realization). That had to. And…voila!