On December 11, the morning after appearing on The Tonight Show, Namath went to a video production studio on East Seventy-eight Street. There, Fu Manchu finally met its match, Namath didn’t like anybody telling him how to wear his hair. But there was a higher principle at stake here: money. Nobody knew it, but the world was about to witness a watershed moment in sports marketing.
— Mark Kreigel, Namath: A Biography
Joe Namath was paid $10,000 to shave off his famous mustache in a TV commercial. Which would lead to the filming of this famous spot with Farrah Fawcett.
(Source: Sports Illustrated)