* AndYouThoughtItWouldFail: CBS initially responded to Lucille Ball's insistence that Desi Arnaz play the husband in her TV show by saying they weren't sure if audiences could believe that a celebrity like Lucy was married to an obscure Cuban bandleader. In response, Lucy and Desi gave a vaudeville tour across the country. The tour became a success, proving to the networks that a TV show of the duo would be huge.
* BrokenBase: CBS aired colorized versions of the ChristmasEpisode and "Lucy's Italian Movie" in December 2013. This didn't mark the first attempt to colorize ''I Love Lucy'', but it did prove divisive among viewers: Some liked the fact that the picture looked more natural than that of an early-'90s colorized print of the Christmas episode, and felt the color added to the humor. Others disliked the fact that the picture still looked less natural than the original monochromatic versions, and couldn't stand the mere thought of altering the picture in so drastic a fashion.
* CrowningMomentOfAwesome: Lucy once did the MirrorRoutine... '''with [[DuckSoup HARPO]] [[MarxBrothers MARX]]!!!''' [[http://www.youtube.com/watch?v=4iNLlYOgFZ4 Here.]] Followed shortly by a second [=CMoA=]: Harpo plays "Take Me Out To The Ballgame" on the harp. [[http://www.youtube.com/watch?v=H16vDiX_PCo Gotta see it to believe it]].
* FunnyAneurysmMoment: Any episode that involves a joke about philandering, or Lucy and Ricky's marriage being in trouble, [[MistakenForCheating or both]].
* HarsherInHindsight: Watching the episodes 'Lucy Meets Charles Boyer' and 'Lucy and Superman' are particularly saddening, knowing both Boyer and Reeves ended their own lives.
** From 1951-1954, Phillip Morris cigarettes was the show's only sponsor. Desi Arnaz died of lung cancer at only 69.
* HollywoodPudgy: UrbanLegend has it that Vivian Vance (Ethel) was contractually obligated to remain overweight, though there isn't evidence of it being true, especially since Ethel only looks fat in comparison to Lucy. Get her alone and she's rather thin.
** From ''The Young Fans'' episode: "Keep jiggling, Peggy."
** "Are you tired, run down, listless? Do you poop out at parties? Are you unpopular? The answer to all your problems is in this little bottle!"
* SeinfeldIsUnfunny: This show ''invented'' the modern sitcom, and every single sitcom that has ever existed since has borrowed something from the lexicon it created, to the point where things that were groundbreaking in the '50s are not even noticable, let alone edgy... unless you are blocked by the NostalgiaFilter. And somewhat ironic for this trope, both the real and sitcom versions of Jerry Seinfeld have proudly noted having NEVER watched an episode of "I Love Lucy" in their lives.