The One With The Cop (Season 5, Episode 16)
The Story: Phoebe discovers a forgotten wallet with a police badge at Central Perk and uses it to scare people into behaving themselves in public, including the cop who lost it in the first place.
Why It's On The List: Phoebe's run-in with the officer whose badge she's been flaunting ended in a first date, not an arrest. Despite the tenderness of this, and Rachel's efforts to help Joey make more female friends, the actual meat of this episode is Ross' new couch. To save money, he decides to deliver it himself and enlists the help of his friends, resulting in the iconic "pivot" scene and its subsequent meme. On the one hand, it's yet another example of Ross's mind-numbing frustration. The schadenfreude that comes from seeing his sofa disintegrate, on the other hand, is pure delight.
Link: https://www.metacritic.com/tv/friends/season-5/episode-16-the-one-with-the-cop