There's a conspiracy theory which says R2D2 is actually the mastermind of the entire Rebel Alliance. I read this yesterday, and last night dreamt a whole little movie about it.
It starts off with a great Rebel leader, who is damn near killed. The other Rebels put his brain in a droid to keep it alive. Before they even install a vocalization unit, their base is attacked by stormtroopers, who kill everybody. Only the "droid" survives.
That isn't really a whole movie, I guess, just the beginning of one, but the funny thing is, it was a really intense dream, and it was actually the only good Star Wars movie I'd seen since Empire Strikes Back.