Mister Rogers' Neighborhood (1968)

Season 29: Episode 4

Rogers recounts his snorkeling adventure with Sylvia Earle, back from 1990. Sylvia Earle visits the television house, and screens a videotape on the sounds of fish. In the Neighborhood of Make-Believe, everyone is upset at the constant bell-ringing and drumming at Henrietta and X's tree. No one can convince him to stop, especially since fewer and fewer neighbors remain uncostumed.