The trouble with the end of the world is that you can’t be sure it really is the end of the world.
If you know that it IS the end of the world, you could just sit back with a cold beer and watch the festivities, because unless you had a spaceship and advance reservations to another world, you’re not going to make it out alive. It is after all, the end of the world.
But if you’re not sure, you get in your car and drive until the inevitable road-buckling that seems to be common with the “almost end of the world” scenarios played out in various styles and film genre. Then you run as fast as you can toward I have no idea what…which I would guess would make you wish you’d stayed home in the first place. It’s much better to use your own bathroom right before the world ends (or almost ends), unless you’ve run out of toilet paper or something.
But if the movie really is about the end of the world and the world ends at the end of the movie, how does the movie itself end?