I remember when Fight Club came out; it looked like just another action movie with a dumb name. I figured it was like "Blood Sport" or something where it would end with a final showdown of sorts between the two main characters in a ring. Instead, it wasn't like that at all, and that's what I like about it. The actual "fight club" is just a medium for telling the story of Norton's duality.
Did anyone realize early on that they were the same person? The flashes of Tyler every once in a while were easy to miss. I didn't realize they were the same person until well into the movie.