I'm not the only one who heard it as "Dark Vader" during childhood.
. . .
R> What costume did you get?
R> Is it an Autobot? [NB: We don't have any exposure at home to Transformers; The things he learns from school!]
R> I like Autobots, and I like superheroes, and I like Star Wars best. [NB: No real exposure to Star Wars either]
[a short time later in the car not too far away....]
W> There were Stormtrooper costumes, but they were too big. There was a Darth Vader costume, but it was black, and if you go trick-or-treating at night, you'll be hard to see. We were worried you might get hit by a car.
R> There should be a Light Vader costume. It's yellow.