Your movie double features
I don't know if anyone else has movies that they like to watch as a double feature or not, but I always seem to watch The Towering Inferno (1974), and The Poseidon Adventure (1972) back to back. I got to wondering if there were any others that I do that with and I will tend to watch Empire Records (1995) and Clueless (1995) back to back as well.
Edit to add, that I'm not really counting sequels, or movies that share a cinematic universe. Like I often will do the entire LOTR trilogy in a day or a weekend.