This cake by Beth Jackson Klosterboer is like a piñata, but you shouldn't hit it with a stick. All you need to do to open it up is to cut a slice. It's shaped like Sweethearts candy and is appropriately filled with Sweetheart candies.
The obvious next step would be to make a Sweetheart-shaped piñata cake filled with Sweetheart piñata cakes filled with Sweetheart candies.
Filling is fail.