GMs: Never let players question your GMing decisions.

Players: Question everything.

This about sums up roleplaying gaming.

Transcript

GM: Let's, uh... go to the Peace Moon.
General Tagge: Once this Peace Moon is fully operational we are vulnerable. The Senate will seize command. They're more dangerous than you realise.
Admiral Motti: Dangerous to your incompetent leadership, Commander, but not to this Peace Moon.
General Tagge: Oh, look at the new guy, coming in and thinking he's irreplaceable. The Senate will—
Obi-Wan: Wait wait wait... How are we hearing any of this at all? I know you like your little NPC dialogue scenes, but this time there's no PC present to overhear.
GM: Is that really important?
Obi-Wan: If you honour consistency and separation of player/character knowledge, yes.
{beat}
GM: If you don't think you have a reason to hear this, I suggest you ignore it.
Obi-Wan: Okay, fine. Just be aware that some people might use out-of-character knowledge.
R2-D2: Like who?
Captain Antilles: {dead} Hey, if I'm actually out of character, can I use it?