+1
Nosferatu a silent film from 1927, the first Dracula movie ... brilliant and very creepy, in fact I will be seeing it again this Friday at our Indi Theatre who are currantly staging a Silent Film festival ... there will even be some guy playing keyboard accompanyment.
I also agree with the above poster with The Cabinet of Doctor Caligari (another silent gem)
Also recently saw Susperia, wow what a surreal adventure that film is.
The 'Dead' series by Romero.
Shaun of the Dead, you just gotta love a film where the cast escape to the pub for safety LOL
The Thing, original and remake.
28 Days Later and 28 Weeks Later both good.
Blair Witch Project, for me very creepy.