Some tech geek with too much time on his hands came up with this fun competition, The Sith Sense. This is basically just like 20 questions. I did it and he actually "read my mind". Try it and see if he can read yours.
By the way, this is another great business idea. It looks like Star Wars teamed up with Burger King to bring this game to life. This is a win, win for both companies. There is a very subtle incorporation. Basically, before Darth Vador guesses the "Burger King" whispers something in his ear then walks away and there is a link to BK.com at the bottom of the site. That's it. Cleaver.