First thing's first, I didn't read this entire thread I just wanted to comment on Avatar.
Why is it people rag so hard on this movie? So what if it has a similar/same story as Dances with Wolves/Fern Gully/Pocahontas/etc. Aren't these stories worth retelling that have a good message, ie "Take care of the planet that takes care of you?" And does wanting to take care of the planet now make you an eco-terrorist?
Seriously people, every movie being released can be related to another movie with similar scenes/ideas. Lay off of Avatar.
To answer the actual question though, it's Beetlejuice. That's my favorite movie.