As a work of fiction, even the most “realistic” screenplay will have some made-up elements. But there’s a bigger question about how to make aliens or time travel or ghosts “believable.” That’s where we get into “story reality.” What is the reality of this world you have created?
A lot of this has to do with how your characters react to the situations you put them in. If you walk down the street this afternoon and come across someone bleeding to death, how would you react? Call the police? Call an ambulance? Vomit and run away? Now what if you were walking down a beach in Normandy on June 6, 1944? You may vomit and run away, but you might also pull out a machine gun and start shooting Germans. Not a great option in the first example, but perfectly understandable in the second.
(image from The Longest Day via: http://www.imfdb.org/wiki/Longest_Day,_The)
The problem is, if you create a fantasy world like Hogwarts or the Shire or Tatooine, your audience can only accept the “reality” of your story based upon how your characters act and react. Apparently, cutting off someone’s arm with a laser sword isn’t a very big deal in the Star Wars cantina. It may, however, be frowned upon at lunch in Hogwarts. Whichever the case, your characters need to react consistently to the “reality” that you have created.
That brings me to Zombie Honeymoon. I can’t necessarily recommend that you watch this movie. I watched it because seeing what doesn’t work can often inform you on what does work. Zombie Honeymoon (hilarious premise) was in many ways a hilarious movie. Newly married husband suddenly becomes a zombie and his wife struggles with the “reality” of that situation. The problem was, she had a very different view of “reality” than everyone else in the script.
The guy at the video store freaks out when he sees the zombie. The local cop is out looking for missing persons. And the best friend runs away when she realizes the husband is “undead.” It’s a consistent reality that aligns with our own reality. But the newlywed wife decides that she’s going to see her husband’s zombification through much as though he had been diagnosed with cancer or Alzheimer’s.
(Maybe this won’t be so bad after all! image via: https://thewolfmancometh.com/2010/09/18/zombie-honeymoon-2004/)
The thing to remember here is that by forty minutes into the movie, her husband has already killed half a dozen people. So instead of marrying Augustus Waters (The Fault in our Stars), she’s really married Michael Corleone (The Godfather).
The premise could still be resuscitated as a farce as the wife hides one body after another and tries to tape her husband’s ears back on for their double date, but it doesn’t. The new wife agonizes over “what to do,” leading to some decent performances and genuinely uncomfortable scenes as she hugs her decomposing husband. But her disregard for everyone else who’s died (including her best friend) and her casual acceptance that her husband is in fact a brain eating, murderous, animated corpse create a disjointed world that doesn’t follow the rules of its own “reality.” It was almost as though everyone else was hired for a horror movie and someone told her it was a Lifetime movie of the week.
Suffice it to say, a consistent “reality” is critical even if your script is reanimating corpses. For more thoughts on story reality and credibility in screenplays, check out these links.