With fantasy and sci-fi, it's based in a real fandom. You're presenting to experts, and their source material is really important to them. They'll come up and ask: 'so when you turned your head slightly in that scene, what were you thinking?' ↗
So that's why one of my rules of parody writing is that it's gotta be funny regardless of whether you know the source material. It has to work on its own merit. ↗