Challenge: a movie that rewards even on the 15th viewing

Let's say that an exceedingly rich, but eccentric, person has a proposition. Someone will suggest a movie for them to watch, and for 3 weeks they will watch that movie five days a week, once per day, 15 times in total. If, on the 15th viewing, they feel that they still got something out of the movie that 15th time, that it was worth that last viewing, then they will give the person whose movie was selected two million dollars! What movie do you choose that will reward so many viewings? Why should they choose your movie? (For the purpose of this thought experiment, you can assume that whatever movie you choose is one that they have never seen before.)