Create-A-Card Competition

Neverending Story and such "stranger stuck in a strange land" stories/movies skirt the edge of high fantasy because they typically have an "anchor" to reality via the stranger. Alice in Wonderland, for example, gives you a grounded (if possibly delusional/dreaming) person in an exotic land. If Alice herself was a magician or whatnot and she didn't come from "earth" it would be easy to say it's high fantasy.

To take this further, take The Wizard of Oz where you have not one but two "strangers in a strange land" (Dorthy and the "Wizard" himself). There you have a combination of fantastic (a living scarecrow, a man made out of tin, talking animals, magic users, etc.) and mundane (Dorthy is a normal girl, the Wizard uses amateur magic tricks and illusions rather than real magic, only "people" have civilizations, etc.).

If you want to be safe, pick subjects that have no strong connections to the real world (basically just about anything you'd find in a typical D&D game). The less sense it makes, the more fantastic.