I'm a big Junji Ito fan, but I haven't really found any good anime that come close to matching the creepiness of his manga stories, including that one Junji Ito anime series that's out there. I think the closest I've seen is Mononoke, though honestly I haven't seen a ton of anime, so maybe I'm missing something. I thought I'd ask to see what you all might suggest in terms of genuinely creepy/unsettling/dark anime movies or series, either similar to Ito's stuff or whatever else you think is good.

Any suggestions?