What do the adults say in charlie brown?

As far as I know only twice. I'd say they were seen in the "It's the Pied Piper Charlie Brown" episode, where they were actually seen and talked, however I think the only actual reason for this was to develop the story. In a charlie brown movie where he travels to France, adults are seen and talk, very breifly though, in minor scenes, but once again adults were only included to make it so the story made sense. In certain episodes, adults are not seen, but if you listen closely you can slightly understand and interperet what the adults said, due to the fact the adults voices where done by someone speaking in english through a piece of a Trombone.