On the web, this quote is attributed to:

Samuel Goldwyn (1882-1974): of  Metro-Goldwyn-Mayer, credited the most frequently and almost certainly the person who first said it.
Louis B.Mayer (1885-1957): also of Metro-Goldwyn-Mayer
Jack Warner (1892-1978): of Warner Brothers
Harry Warner: of Warner Brothers
Walter Kerr (1913-1996): Theater critic
Cecil B. DeMille (1881-1959): Director.
D.W. Griffith (1875-1948): Director
Dr. Lambeth (evidently an analyst at RAND)
Matt Sommer (a current day screenwriter)

That's gotta tell you something...or should I use Western Union?