what's your top five horror and/or mystery anime's?

I suppose Vampire Hunter D, Night Warriors/Darkstalkers, Hellsing, Occult Academy, and Hell Girl might make up the list.

Here's a picture of Occult Academy, which should qualify as both a horror and mystery anime.

Top Five:
1). Higurashi No Naku Koro Ni
2). Jigoku Shoujo
3). Ghost Hunt
4). Mahou Shoujo Madoka Magica (it is classified as horror, drama, magical girl, tragedy, and deconstruction)
5). Le Portrait de Petite Cossette

Alternative Top Five-
1). Another
2). xxxHolic
3). Shiki
4). Paranoia Agent
5). Elfen Lied

Honorable Mentions-
Deadman Wonderland
Mirai Nikki
Umineko No Naku Koro Ni

Horror:

Hellsing Ultimate
Deadman Wonderland
High School of the Dead
Mirai Nikki
Another

Mystery/paranormal: i cant think of any actual mystery except Death Note, i figure these are close enough, they all involve characters searching for one thing or another :)

Mushi-Shi
Ghost Hound
Death Note
Nabari no Ou
Angel Beats