A bit of music to set the mood. You can all sing along.
It’s that time of year when I recommend that everyone watch Mononoke, unless I forget. So, if you want to view something appropriate to October 31 done with intelligence and artistry, watch an arc or two of Kenji Nakamura’s first and best anime. It’s not necessary to watch the stories in order. My personal favorites are Bakeneko (“Goblin Cat”) and Nue (“Japanese Chimera”), episodes 10-12 and 8-9, though all of the tales of the simple medicine seller are worth your time.
A couple of other possibilities:
Madoka Magica — Not for casual viewing. If you try to marathon this in one evening, you’ll be an emotional wreck at the end. You do need to start at the beginning.
Hozuki no Reitetsu — Something a little lighter, set in the Japanese version of Hell. The first episode introduces the main characters, but after that you can skip around. My favorites include the fourth episode, which introduces the demure rabbit Miss Mustard, and the eighth, which examines J-pop and modern art.
And there’s always Natsume Yujin-cho.
I have no particular taste for horror and creepy stuff. Although there’s plenty, most I’ve seen bores me. The shows mentioned above caught my attention for reasons other than mere “chills.”