Ghoulish elements are the bread and butter to any spooky movie. Not every film in the genre, from the straight-up terrifying to the Halloween-themed to the family-friendly, features ghosts—but the good ones, the kind that leave you questioning everything, are filled to the brim with them. Sometimes the ghosts very friendly (Hi, Casper!), sometimes they'll help you get rid of annoying house guests (Hello, Beetlejuice!), but sometimes they'll steal your children for their own evil benefit (yeah, not calling out that one). Ahead, here are 28 best ghost movies of all time. I'm not saying you should have the Ghostbusters on speed dial before watching one of these moves, but uh, you might want to play it safe.