I often get tripped up by the hero rejecting the call to adventure in the "official" hero's journey, since in so many of the examples I can think of, the hero is champing at the bit to start the adventure.
I can illustrate this with the two films I'd like to show in class to introduce the hero's journey, and map it as a class: Stardust and Moana. Neither of the heroes of these stories refuses the call to adventure (on the contrary, they chase it with a zeal that encroaches on foolhardiness).
In Stardust, Tristan is so eager to get to the "extraordinary world" that he successfully gets past the man whose family has been guarding the gate for centuries.
In Moana, Moana is so eager to start her adventure that she nearly gets killed attempting to sail past the reef early in the film (Maui refuses the call, and one point I'll want to draw out in Moana is that every story contains multiple heroes' journeys, and would be very different stories if different people were put in the center of it).
As I'm typing, it occurs to me that Finding Nemo is a good example of a hero reluctant for adventure, but the "reluctant hero" definitely feels like a (mostly comic) subgenre.
So anyway, here's what just occurred to me: having an adventure is not the same thing as being a hero. Tristan is eager for adventure, but it takes him an incredibly long time to give up on kidnapping a star (making him actively villainous) and instead become a hero. Moana is thrilled to go on an adventure (and unlike Tristan she is morally driven from the start of the film) but when things get really tough she stops believing she CAN be a hero, and literally refuses the ocean's call to heroism.
How I will teach this is to ask students at the start of class to write about a time they had an adventure, and a time they did something heroic, making it clear that they don't need to be the same incidents. Then we'll discuss the difference between "having an adventure" and "being a hero" and introduce that nuance to the hero's journey.