I've always had this theory....it is kind of lame, but it also kind of makes a little (very little ) sense. Maybe SW is just one big story of two droids lives. Kind of like a droid odd couple...but juiced up w/ a galactic storyline & a happy-ever-after story line I know it isn't the case, but isn't it funny that they are the only ones in every movie? Besides Anakin...but he doesn't count cause he changes his persona.