The First, Last, and Final Arbiter of any rule call I make. This takes Rule Zero and Stunt Systems to new levels. Not merely satisfied to give you a +2 or +1 die to a roll for a good description, you can potentially break the laws of reality if your description is awesome enough. This applies not only to actions but to characters as well.
The reason I do this is to encourage the MOST important thing about table top RPGs... Imagination. If I wanted to play a rigid rule set, I could play a computer game and have better graphics. I want a chance to pretend all those amazing things that I wish I could be doing in those games.