You don’t always need to have a theme in mind when you start writing a screenplay, because of the effectiveness of today’s online theme generators. But eventually you should probably have one in mind, at least to talk about in interviews. Nathan and Ryan praise the godfather of themes, Shakespeare, who pretty much created all the great themes still in use today. They perform script surgery on “The Martian,” and Ryan pitches his latest screenplay in progress, “In Memoriam," set in the stunning and very fun to visit country of New Zealand.