Speculative Fiction - mainly meaning the genres of horror, fantasy and science fiction, but can take other forms such as alternate history. This is every movie I have seen that falls under this umbrella term somewhere: starting as a merged version of my previous sci-fi/fantasy list and my horror list, which I've now discontinued updates of individually in favour of one big list being updated with every 100 new movies added to it.
Full genre list:
Fantasy
Science Fiction
Horror
Supernatural
Superhero
Alternate History
Vampire/Werewolf/Zombie etc (not always strictly horror movies)
Not all speculative films may fall under these traditional genre tags, so I've used some discretion for additional titles. Run Lola Run, for example, is certainly a movie of speculative fiction.