My Friends Tigger & Pooh Season 1 Episode 27

Darby: Okay, so this morning I left Buster here with Lumpy. And we haven't seen Buster or Lumpy all day.
Pooh: So perhaps they were seeing each other?
Tigger: And maybe Roo-boy is with 'em too. He is Lumpy's best friend forever and all. I mean, you heard the song.

Presumably, Tigger is referring to the song "Shoulder to Shoulder" from the 2005 Pooh's Heffalump Movie. In this song, which celebrated Lumpy and Roo's budding friendship, Carly Simon sang "I've never had a best friend before / So I can't be sure what it feels like / But I think it feels more like this I do / I think I feel more like myself when I'm with you."