"The Nightmare Before Christmas" was very controversial in 1993. My family felt any movie that dared allow Halloween and Christmas to co-exist must have been co-produced by the Devil. Go figure! It's of course become a classic and needs no explanation or persuasion on my part, as to why it's on this list of Halloween MUSTS!
It's also okay if you forget to watch it before Halloween, as it has so many Christmas parts it's the perfect "bridge movie" to watch in November! (Other bridge movies include: "The Bridges of Madison County" and "Love Can Build a Bridge: The True Story of the Judds.")
Sad Part: What if I worked at a Disney Park and they said I was too fat to play Jack Skellington?? "You can play the really fat Oogie Boogie," they'd say, "or the really fat Santa, or the really fat two-faced Mayor, but Jack can't be played by someone who is morbidly obese! It's called staying true to the character!" You can't argue with reason.