The only time I can recall being as spooked by a film was when my parents took me to see "Hangover Square" - a gothic Jack the Ripper thriller - when I was 8 years old. I guess they couldn't find a baby-sitter. That took me about a year to get over, a low-key, all-too-realistic chiller about the banality of insanity.
"Cure" is such a perfect depiction of madness that just about every shot could be framed & hung in a gallery. You can't analyze this one, it doesn't follow a cartesian line of logic; nor does it blast you with halloweenish surprises in the style of Elm Street & its knock-offs. This has far deeper & subtler impact. I found as I relaxed into this film that images of recurring dreams & nightmares I've had since childhood arose & blended into what I was watching. Can't get much creepier than that.
That said, the images & emotions that this film evokes are on a very high level of poetic art. One of the most impressive elements of "Cure" is the director's ability to convey the magnetic manipulative appeal of Mamiya - surely one of the scariest things in real life & very difficult to convincingly convey on screen.