Peanut Butter & Jelly Sandwich is an unofficial title of an animated PBS Kids commercial that started airing in the 90's/Early 2000's, and stopped airing around 2013 or so, along with other old PBS Kids Ad's.
The Ad centers around a bunch of people in a circle, with a shape-shifting creature in the center, the creature turns into many things, asking the people if they like what he turned into. He eventually turns into a Peanut Butter & Jelly sandwich, And turns everyone else into peanut butter sandwiches, and they reply "That's not right!" In a funny manner.
Low quality footage of the Ad was uploaded to youtube on November 24th 2017. It currently only airs in some areas.