About when Luke *bonked* his head.
Like Luke, I was expecting a great warrior or at the very least somebody along the lines of Obi-Wan.
Well, though I didn't suspect him to be Yoda, the minute he told Luke who he was, I remember then and there believing that he (Yoda) could take on Vader and the Emperor. OK, this was back in 1980 ... but it is funny that by the end of the film, even if Luke still had some doubts, I remember I was listening to the Jedi Master.