0Why Is 'Mad Men' So Secretive?Why is 'Mad Men's creator Matthew Weiner so secretive about the show's plot? Watch a teaser of Brian Williams's 'Rock Center' interview, which airs tonight at 10 p.m. on NBC.Updated Apr. 24, 2017 12:11PM EDT / Published Mar. 21, 2012 5:14PM EDT MSNBC