When you're writing for the screen, you have to be hyper-conscious every moment of how the audience is going to react. If you write just one scene where the audience is confused or it breaks their concentration in some way, then you've lost them, and you might never get them back.
Friends: not one. Just a few acquaintances who imagine they feel something for me and who might be sorry if a train ran over me and the funeral was on a rainy day.