Have you ever read/written something in a fic that ended up happening in canon in some way.

For example, a few years back I was doing a rewrite of an older fic in which a character that hadn't shown up in years (since not long after I first published the fic) has trauma from being trapped in a small room and away from the world by one of his brothers. No one knows this happened to him since he's persumed to be somewhere else. During my rewrite, the character (that is persumed to be dead or in hiding) shows up after years without appearing on the show because he was trapped in a small cage by one of his brothers. The trauma responce in canon was also pretty similar.

It felt sort of validating that my AU story lines seemed to fit into the canon work somehow.

Also while writing this I remembered that I also wrote a fic in which a character calls on an entity that is supposed to kill him, so that he can save the man he loves. It goes down a different way, but that same plan is how that same character fights for that same man he loves in a fight with partly the same enemy 4 years later.

I feel like stuff like this happen a lot because we're all a bunch of monkeys with typewriters here, so please share your funniest or most surprising "hey I read/wrote that" moment.