Honestly, the only thing I can think of is this:
Batman: Quis custodiet ipsos custodies?
Green Arrow: "Who guards the guardians?" We've got it covered.
The context of that was the Justice League Unlimited Episode Divided We Fall. Superman tried disbanding the JLU because of crap that went down in it, but Green Arrow talked him out of it. Also all of this was at a large public gathering/press meeting, so yeah.