Since the dawn of cinema, viewers have enjoyed the thrill of being terrified by a whole cavalcade of movie monsters - everything from demons, witches, vampires, to creatures from Black Lagoons.
But there has always been something particularly chilling about ghosts.
It's likely we all know someone who has claimed to have seen a ghost before - a friend, a family member - maybe you think you've seen a ghost yourself? Somehow, ghosts remain an elusive phenomena that have never been fully proven to exist, or disproven.
There are old photographs of translucent shapes on stairways, audio recordings of eerie whisperings from graveyards, and whole television shows dedicated to hunting them down in abandoned buildings. It's tough to be a fully fledged sceptic when ghost stories are so ubiquitous. Perhaps that's why we find ghosts a more chilling movie monster than, say, The Blob?
Or maybe the true terror of ghosts is simply that they remind us of our own mortality...
Be they poltergeists flinging objects around kitchens or ghastly apparitions of the undead popping up from the shadows, this list counts down the scariest spectres and foulest phantoms ever to appear on celluloid.