Well, one person - who wasn't part of our group - became our spoiler-free God by not even knowing the title of the movie for Episode II when he walked into the theater on opening night to see it. In fact, he had the title printed on the BACK of a T-shirt he was wearing, but had successfully avoided all news about Star Wars for the preceding three years such that he did not even know the name of the movie.
For the third prequel, a few of us tried to replicate this feat. Most of us did not get beyond 24 hours after the title was announced. But one enterprising young man made it through to the last couple of weeks before the movie opened. He had even gone so far as to have someone block all mention of the title or its acronym "ROTS" from appearing on his computer. Alas, this was his undoing ... because at one point, the answer to a question which was obviously "CARROTS" appeared on his screen as "CAR****" - - instantly giving him the initials "ROTS" and, two seconds later, d'uh - the title "Revenge of the Sith."
Heheheh.