Happy Days: The Third Season is definitely a peak in the show's lengthy history, just before the series took a turn for the silly (or sillier). This was the year Laverne (Penny Marshall) and Shirley (Cindy Williams) were introduced to the world on Happy Days (before landing their own spin-off series). And armchair TV historians will take note how sexist the show could be while it simultaneously takes a minor stab at American racism in "Fonzie's New Friend" (in which the Fonz shows up with an African-American pal to play drums in Richie's band, and gets a hostile reaction from whites in the community). --Tom Keogh

Laverne and Shirley: The Third Season Set in the 1950s, this half-hour situation comedy revolved around the friendship between bright-eyed, naive and demure Shirley Feeney and brassy, tough-talking, street smart Laverne De Fazio. Two bottle cappers for Shotz Brewery, the duo dated an array of questionable men, tolerated their dippy, loony neighbors Lenny and Squiggy, and forever pursued to "make all their dreams come true."