This short begins with Ko Ko the Clown taking Betty Boop to the museum. There she wanders about--not realizing that the place is closing. Once she realizes it, the place is locked and she begins singing a song about how depressed she is--and the various odd looking skeletons really enjoy the cartoon. Eventually, Bimbo the Dog comes to get Betty and the skeletons all bury themselves.
As you can probably tell from my description there isn't a lot of plot here--even for a cartoon. You can also probably tell that the film is ultra-strange. I see it as a turn off your brain and enjoy sort of carton--one you cannot think about or else you'll soon realize that there really isn't much to this of substance...sort of like the skeletons.