The "Life in Dorkath is for Adults" entry by Kirk, below, is the first example of a little experiment for the Dorkath game.
I want each of the players to contribute at least one fact about the game that their Heroes could not in any way determine. Something that could not normally be defined by your individual character creation.
So you could write anything like the following:
Now, while you can define these things, if they don't appear on someone's character sheet, then the characters don't know about them.