I don't know any other business that tells you not to go in and buy their product.
Source: On the rating of films; in NY Times, 5 May 85
-- Jack Valenti, (Sep 5 1921-2007), US Film Executive; He has been the chief spokesman and moral arbiter of the motion picture industry in the U.S. as the president of the Academy of Motion Picture Arts & Sciences and Motion Picutres Association.