Watching Star Wars movies in chronological order is a tricky business. Especially because the first Star Wars movie ever was actually four movies in chronological order. Then you have the prequel and recent trilogy to fit the timeline, not to mention the random animated clone war movies that everyone always forgets. In addition, if you watch them in chronological order, you will not get the full effect of one of the greatest revelations in movie history, because you already know that Darth Vader is Luke's father!