I was watching Discovery HD the Science of Star Wars and C3PO and R2D2 were the hosts. They talked about master Anakin becoming more machine than man as Darth Vader. He then stated that he was the one that built me. Later in the show he said the "oh, thank the maker!" quote again. Granted this is not the movies, but I thought it was funny given this thread and the timing of the show, that in this show apparently a mind wipe wasn't a factor. He knew vader was his maker and what anakin had become and still called him master anakin. He even said there is always some of your maker in you (the robot). Which I thought was kind of dark comment given what anakin became. C3PO as vader's henchman hmmmm............