It's the candy hole!
Seeing as how this was the first episode, I was thinking this would show how the cat and rabbit got into the candy hole. Of course, it shows that in the intro anyway. The animation of this series is just great with how ridiculous the characters looked with their superimposed teeth and brains. I thought it was really funny how they tore the guy's arms off. He was about the only thing that was not made of candy, but it would not have mattered anyway. All the candy they ate bled like that guy did!
The set is easily the most enjoyable part of this series. As this is the introductory episode, there is not much that goes on, but it does introduce the characters well. It's too bad this series did not become that popular on this website, but at least it got a high rating. It's nice to always identify you by name on your author & file information. I like how you can still see the brains in the animals' mouth.