What is the Halloween themed movie where kid is killed in a furnace at school by school bully?

Ash: What is the Halloween themed movie where kid is killed in a furnace at school by school bully?
What is the Halloween themed movie where kid is killed in a furnace at school by school bully? It is the one where these kids in the end have a party in the house he haunts, and invites the whole school. The kids are brother and sister.

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Answer by nora the explorer
When Good Ghouls Go Bad w/ Christopher Lloyd?