Shared universes are all the rage these days and have become the norm for major film studios. Whether it’s Marvel, DC, or Star Wars, interconnectivity is the name of the game in Hollywood. While these are the most obvious examples of the phenomenon, they may not have been the first of its kind. Filmmakers have seemingly been toying with shared universes for years, though being far subtler with the process than studios are today. You may never look at one of your favorite films the same way again. Here are 10 movies you had no idea share the same universe.