In the cinema I really get "spooked" by the more subtle hosts, not bright, flying ghosts with loud, echoing voices.
Below are photos of the scariest movie ghosts that I know of.
First is the ghost from the 1989 BBC movie, "Woman In Black"
Second and third are the ghosts from "The Innocents"
This fourth photo is Madeline O'Malley from the 2011 movie, "The Innkeepers"
Br-r-r-r! Good evening!