The Skeleton Dance (1929)
There's nothing more Halloween than this old Disney cartoon about a bunch of skeletons dancing around a graveyard at night. All the classic spooky shit is on full display. Black cats, big spiders,a howling dog, an owl, and of course the skeletons. The ghouls dance around, playing each other as instruments (don't be weird), and having a grave old time. You saw what you saw. All hell breaks loose and the grim reaper gets served before sun rise. Which of course means it's time for the skeletons to rush back to their graves.