My wife, who, god bless her, I've subjected to more Star Wars in the years of our marriage than is legal in most principalities, has an interesting opinion.
She doesn't see Yoda as acting intentionally silly in ESB. He's not trying to fool Luke.
He's actually gone peculiar.
She, inspired by the PT, sees it like this:
Yoda was (in her words) Big Daddy Jedi of the Universe. For 800 or so years he was 'the man' with everyone telling him how wise he was. Then he 'blew it' and saw everything he stood for and defined himelf by destroyed, largely his own fault, and he went from having the Jedi penthouse in the capital of the galaxy to living in a nasty swamp. After 20 years of eating mud he's actually lost his mind, and it takes him a while to get his act together. That's when he starts talking to Obi-Wan.
It was an interesting viewpoint, one I certainly never thought of.
Thoughts? Was Yoda just plain nuts?