The one that always made me feel feels was the episode where he told the story about a fan who came up to him and lamented that he couldn't be a painter because he suffered from total colorblindness, so Ross dedicated an episode to him where he painted only in greyscale, using black and white paint in varying mixtures.
I told my mother about this and she could not comprehend there were 54 thousand viewers at the time I showed her and she told me to ask my brother if he is watching it and he said "No, but I've seen most of them" and she was really confused
This man did not live to see the day that 30,000 people are watching and performing running commentary on his oil paintings together and that makes me very sad. He would have loved this.