I recently read an interesting article by Cabel Maxfield Sasser (http://www.cabel.name/2009/09/kashiwa-mystery-cafe.html) about a cafe in Japan. The idea behind the cafe is you order for the next person and you receive what the person before you bought so you get a surprise for your meal/snack.
I like the idea and would like to try it out but I would be worried about going there regularly because I am a very picky eater. It would help if they served a lot of food that I liked. One thing that would suck would be to find something that they served that you really like and not be able to order it and know you were going to get it.