One of the most restaurants I ever went to was a restaurant. It was based around the theme of a detective agency, so to get , you had to have a case.
Then somebody would you in, you'd walk down some stairs into looked like a 1940s detective's office. Then a detective behind the counter would ask you what your case and you had to give them a case. Then he a button and the bookcase then open to reveal a speakeasy-style restaurant behind with really lighting and all done out in a 1940s . It was a lot of fun.