Brad Pitt and Edward Norton learned to make soap for Fight Club

To prepare for the movie ‘Fight Club’, actors Edward Norton and Brad Pitt learned how to grapple, fight, and box in order to better play their characters. However, they also learned how to make soap. Not to give away any spoilers, but making soap does play a fairly essential role in the movie, and they apparently spent more time learning how to make it than any other skill they learned. It all paid off, with Fight Club becoming a massive cult hit.