For 11 seasons, Happy Days brought smiles to television screens across the nation. The sitcom followed the Cunninghams, a middle-class family, and their trials and tribulations in Milwaukee, set in the mid-50s era. It became one of the biggest hits in television history, and is still iconic to this day.From 1974 to 1984, Happy Days helped revolutionize TV programming, while teaching the nation valuable life lessons and giving plenty of laughs.If you're curious about what went behind the scenes of your favorite series, here are 10 facts that will make you join Fonzie in saying "ayyy."1. Happy