The One with the Unagi (Season 6, Episode 17)
The Story: Monica and Chandler give each other awful Valentine gifts, but much more importantly Rachel and Phoebe start a self-defense class, prompting Ross to show off the skills he doesn’t actually have.
Ross began Friends as the mopey unhappy guy with puppy-dog feelings for Rachel. But as the evening progressed, we saw Ross in a less favorable light. By Season 6, he was claiming to be an expert in a fictitious karate school called "unagi," which he says translates to "a state of absolute awareness" but is simply the Japanese term for eel. It's something else to watch three individuals who aren't adept at martial arts fail at what turns out to be a game of vengeance.
Link: https://www.metacritic.com/tv/friends/season-6/episode-17-the-one-with-unagi
