Ghosts are classic scary creatures–vampires, zombies, and ghouls may come and go, but ghosts have a timeless appeal. There are some friendly ghosts out there,  Bootsy Collins, for instance, and Patrick Swayze, but today we're here to discuss the scary kind of movie ghost, six of them in fact. So pull out your sophisticated ghost-hunting equipment and your state-of-the-art ectoplasmic goggles, because these ghosts need to be stopped.

13 Ghosts, "13 Ghosts" William Castle's horror classic is about a common haunt of movie ghosts–the haunted house. And it's no wonder it's haunted, the house used to be owned by a Dr. Zorba, who died studying ghosts of the afterlife. There is all kinds of dream-haunting material to be found in the ghosts here. There's a headless lion tamer, a flaming skeleton and lots of creepy goings-on with kitchen appliances and furniture.

Mother and Daughter-in-Law, "Kuroneko" It's the age of the samurai, but not everybody is happy to serve some roving bands of samurai. These two were brutally raped and murdered by a few of those samurai and came back as the kind of ghosts that seduce samurai before turning into cat-like beasts and ripping them apart. Yikes.

The Overlook Hotel ghosts, "The Shining" These are some of the scariest ghosts ever captured on film, mostly because much about them goes unexplained. Take, for instance, the infamous image of a man dressed like a dog performing some kind of ghostly sexual act with a man in a tuxedo. It's almost as terrifying to the audience as it is to poor Shelley Duvall, who has to run not only from the ghosts at the Overlook Hotel, but her maniacal husband who wants to turn her into a ghost with his axe. There's also hundreds of gallons of blood and a pair of creepy twins, in case your nightmares aren't crowded enough.

The Fog, "The Fog" These movie ghosts are a part of the whole "pirate ghosts or ghost pirates" debate. The question isn't settled in the film, but you do get to watch the ghosts cut lots of people to shreds. There's a maritime component that also serves to haunt dreams (lots of gross-looking seaweed and flowing saltwater). Like the lady says, "Keep watching The Fog."

The Stay Puft Marshmallow Man, "Ghostbusters" In the paranormal community, appearances are often deceiving. For instance, The Stay Puft Marshmallow Man looks like a harmless fat sailor made out of marshmallows, but he's actually a massive harbinger of doom. In the movie, he's defeated by the Ghostbusters, but try telling your nightmares that.

Beetlejuice, "Beetlejuice" Beetlejuice represents the classic trope of ghost stories that while ghosts are easy enough to come by, good luck getting rid of them. In his case, all you have to do to summon him is say his name three times in a row, and that's all you have to do to get rid of him, too, but he's pretty good at using his supernatural powers for preventing you from being doing so. Those powers are also put to the use of wreaking general havoc, which is the prerogative of all ghosts.