Tell me about some Rule Zero discussions you've had

We've all heard the line "Just Rule 0 it" when talking about something we wanted to do in Commander but couldn't. Tell me about some things that you've used Rule 0 for, either successfully or unsuccessfully.

Just to kick things off, I've used Rule 0 to play un cards in Commander. Not a full blow un deck. I have [[Nearby Planet]] in two different decks as the only un card in the whole deck.