When you hop up and down for 10 minutes because you've finally met someone else who's read Sanderson and knows the Cosmere.
When you feel like a idiot because you don't know Alethi, Aeons, Allomantic symbols, and you don't have the entire works of Brandon with dog ears and bookmarks showing all the easter eggs.
And I have a giant piece of paper that has all the worlds with their shards,magics, worldhoppers, and timeline.