Over the years, no advertising campaign has attracted as much attention as the milk mustache "Got milk?" program run by the National Fluid Milk Processor Promotion Board.
Such celebrities as Bill Clinton, Kelsey Grammer, Naomi Campbell, Joan Rivers, Christie Brinkley, Jennifer Aniston.... have been shown with milk mustaches. Just about everybody who is anybody has appeared in the campaign.
As part of pop culture, the campaign has been endlessly lampooned. It has been spoofed, parodied, and copied on everything from Leno to Letterman, sitcoms to movies...Ballantine Publishing Group even issued a book on the subject, The Milk Mustache Book by Jay Schulberg.
If the milk mustache campaign is America's favorite advertising campaign, why isn't milk America's favorite beverage? Per-capita milk consumption continues to decline, reaching its lowest level last year?
Source -- The Fall of Advertising & The Rise of PR. Al Ries & Laura Ries