Not all disaster or apocalyptic movies are serious, as some are also very funny, including Airplane!, Dr. Strangelove, and Night of the Comet.
Large-scale disasters are usually taken seriously in the world of film, and so too are movies about the end of the world, for obvious reasons. There’s a tremendous amount of drama to mine from depicting a real-life event (like in Titanic), or trying to outline how the end of the world could come about, and what it might look like for anyone unlucky to survive an event that decimates most of the planet’s population (like in Threads).
