YMMV / Happy Days

  • Base-Breaking Character: Chachi-nated, or De-Chachi-nated? Nick at Nite even made a marathon out of this premise, and viewers got to vote.
  • Broken Base: Despite being the Trope Namer for Jumping the Shark, a term that was coined when Fonzie jumped over a shark during Season 5, opinions widely vary among fans on when the show actually started going downhill. Some argue that the show went downhill as early as Season 3, when the show started being taped in front of a live audience. Some will say when Fonzie actually jumped the shark. Others will say when Richie and Ralph left the show after Season 7. A number of fans will even argue that the show stayed good for all 11 seasons.
  • Crowning Moment of Funny: Fonzie's been using "Sit on It!" for years, to great reaction. When Marion of all people uses it on him, the reaction from the crowd and Fonzie himself was priceless.
  • Darker and Edgier: By the final season. Well, as D&E as you could be with this show. More dramatic moments (among them an Attempted Rape of Joanie), the use of "hell" and "damn", and Fonzie showing more weakness.
  • Ear Worm: C'mon, sing it with me: "Sunday, Monday, Happy Days...".
    • The "Pumps Your Blood" song.
  • Ensemble Darkhorse:
    • Fonzie in the first two seasons, so much that he became a Breakout Character and was promoted to second billing, after Ron Howard.
    • Mork was only supposed to be a one-shot character and his episode All Just a Dream, but Robin Williams' performance was such a hit that the episode was revised to make the events real after all and gave him his own spinoff.
  • Franchise Original Sin: The moment of vertical ascension over an aquatic carnivorous animal is considered merely the point where Fonzie's Flanderization into a superhuman and the loss of the 1950s motif reached its zenith. Both those things had subtly been going on as the seasonal rot kicked in.
  • Hilarious in Hindsight: In one episode, a martial arts class is taught by Arnold, played by Pat Morita. Happily, Daniel-San was a better student than Richie.
  • Replacement Scrappy: Roger.
  • The Scrappy:
    • Roger, and really anyone introduced in season 8 and beyond.
    • Chachi was always The Chachi. He was popular with the girls, but retroactively, amongst older fans? Please.
  • Seasonal Rot: It started out as a very cool, low-key show, then became the ideal version of a standard sitcom with a Studio Audience. It'd started getting worse (the Trope-Named Shark-Jump) even before Richie left, but only got worse after that. Fonzie got a temporary full-time girlfriend for one season, and things got increasingly worse with gimmicks and nonsense until a thankfully fantastic final episode.
  • Some Anvils Need to Be Dropped: According to Garry Marshall, "Richie Almost Dies" was written for this reason. He explained that he was contacted by counselors working with abused children who watched the show. These kids refused to cry and kept their emotions under wraps, so Marshall wanted to have Fonzie go through an emotional breakdown in order to show these kids that it was okay to cry.