You could watch this Hyouka clip on loop

Seriously though, I’m not really a rewatcher, but here are some possibilities:

• Psycho-Pass
• Made in Abyss (pretty much all the CWs for this anime, it’s definitely not for everyone, but I think it’s incredibly well done for what it is)
• Higurashi
• Death Parade (not entirely sure if this fits, but it’s great and you should watch it)
• Zom 100: Bucket List of the Dead (premise: a zombie apocalypse is preferable to the soul-crushing experience of being a Japanese salaryman)
• Mononoke (HIGHLY recommend this one, really incredible art style)
• Mushishi
• Puella Magi Madoka Magica (perhaps this one’s too obvious to mention, but it’s popular for a reason)
• JoJo’s Bizarre Adventure Season 1 (it’s got vampires!)
• Perfect Blue (movie, psychological horror)
• Serial Experiments Lain (not horror, but definitely unsettling and strange)

Out of everything I mentioned, I think the only one that both fits the prompt precisely and that I highly recommend is Perfect Blue. Higurashi’s an acquired taste (wasn’t really for me tbh), but it’s also very much in the spirit of the season. Made in Abyss is excellent and definitely horrifying, but also goes too far for a lot of people–definitely do your research before you watch this one. All the rest are just good shows in general that I’d recommend to anyone, so feel free to check them out at your leisure!

edit: added MAL links