An upside-down cake is a cake usually made in a pan with a curved bottom then, once cooked, turned over and allowed to set, and is eaten upside-down. Usually, chopped fruits such as apples, pineapples and cherries are placed at the bottom of the pan before the batter is poured in, so that they form a decorative topping once the cake is inverted.
Turning the upside-down cake is a critical process, as if done improperly, part of the cake can remain attached to the pan, ruining the final aspect. In order to allow for a better detachment, the bottom of the pan is usually covered with butter, and in some cases with sugar too. Flour, instead, is generally to avoid.
Pineapple Upside-down cake is referenced in the Brak song "I Like Hubcaps" from the album: Brak Presents the Brak Album Starring Brak. In the song, Brak says: "I like pineapple upside-down cake, why's it upside-down? WHY'S IT UPSIDE-DOWN?"
In the first episode of The Jetsons, Rosey clobbers Mr. Spacely with a pineapple upside-down cake after he makes an insulting comment. Spacely then fires George, but later calls from a pay phone and offers him his job back after tasting the cake - which he is still wearing on his head.
A PBS special in 1976 reported that the upside-down cake was a choking hazard for small children. This caused wide spread panic in the food industry that lead to massive recalls in baking pans.