I had the otaku-honor to be the official photographer during one of the first “long distance trooping sessions” around Tokyo’s streets and trains. It was pretty difficult to take pictures of a big black thing walking by dark streets, I learned many ways to trick my camera. Had lots of fun seeing tired Japanese people with boring faces going home after work changing to a surprise/smiley face when noticing they were walking next to a Darth Vader. Look at people generally ignoring Darth Vader presence but when someone starts to take one picture everyone looses his shyness and joins the Vader photography session.
We found someone with a light saber, fight!