Reasonable on 13 July 2012
I wouldn't say anything scares me as an adult, but the following films are all perfectly unsettling if you invest in them (mainly Western films although I think many Asian horror films are the best - The Ring, Grudge, etc):
The Shinning
Texas Chainsaw Massacre (original)
Manhunter (Brian Cox Lecter - or Lektor - for me plus a better sense of mad horror than Silence I think)
The Haunting (0riginal - an oldie but still best evocation of sense of spirits ever)
The Exorcist
Alien
Try to be reasonable... its easier than you think...
