Wow, it never even registered to me until I read this comment that the Star Wars movies didn't have opening credits. They're usually so forgettable anyway, and after reading that article, it seems so silly and ridiculous that all the various Guilds and Associations and Hollywood Political Units got so butthurt over that decision.
Lord of the Rings also famously does not have opening credits. Just runs right into the film. With the expectation that you might have just finished the previous film and ready to start the next.