The Case of The Spelunkean Explorers, previously mentioned here in a post by cousin_it, offers a fascinating array of examples of different legal theories. Some of them are useful to think about in the context of metaethics, while others are more useful in discussing the hidden complexity of wishes.
Iksorod and I made a Google doc of intro-level training materials for rationality / critical thinking. We'll keep adding to it as we find more stuff. Please comment with your own additions.