So it seems that the more traffic you get to your IMDB profile, the higher you get listed in the IMDB movie credits. This happened to Alexander Rhodes who is an extra in the new Tom Cruise move Jack Reacher. He posted his profile on Reddit and now look at the IMDB entry for Jack Reacher.
But thanks to Buffy for the link
Update: He is now ranked above Tom Cruise and all others in the movie.