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It was a fic on the kinkmeme (unfortunately haven't been able to find it) where the actors of the Avengers all exist in-universe as actors, and the Avengers watch movies with these arbitrary actors that just so happen to look exactly like them. I think Thor wanted to pay "his avatar"/'Chris Helmsworth' to get plastic surgery to look different because he didn't like one of the movies. And Tony wanted to ban a movie because something really bad happens to a Gwyneth Paltrow character.