During the filming of Gods of Egypt, the actor encountered a comic fan named Charles Carter, who happened to be a security guard on set. Boseman tells the story of how Carter foresaw the actor getting the much-coveted role on Jimmy Kimmel Live.
"As a matter of fact, some of the fanboys and fangirls, they somehow have, some of them have some prophetic powers I guess. There's this one guy in Australia, I was filming in Australia, and I was on set, and this guy was doing security, his name is Charles Carter. This was Gods of Egypt. This was probably a year before, a year before. So he has them put his first issue of Black Panther, an original 1977 issue, the comic itself, the first Black Panther comic book, in my trailer and writes a note, and says "I believe you're going to be Black Panther", like just out of nowhere."
At the time, it was a dream for Boseman, but nothing near a reality. Lo and behold a year later he would be cast in the role for Civil War, alongside his own solo film.
It sounds like Carter has some powers of his own, though. Who knows, maybe we'll see him in the Avengers someday.