"HP and the Goblet of Fire" has got to have the most "child logic" plot ever.
You can just see some eight-year old explaining it.
"His name's on the list, so TECHNICALLY that means he has to compete!"
Even though literally nobody wants him to, and the rules say he can't?
"Yeah, because, if your name's on the list, then you're OFFICIALLY in the game and you have to play. Officially"
Octodon is a nice general purpose instance.