Poltergeist, the 1982 horror flick directed by Tobe Hooper, is possibly the most haunted movie of all time. Some believe the Poltergeist curse began with the scene when the mother falls into a pool and is surrounded by skeletons. According to actress JoBeth Williams, those bones were actually real human remains (because they're evidently cheaper than fake ones), and after that creepy scene, weird stuff started happening to the people involved with the franchise. For example, Dominque Dunn (who played the oldest daughter, Dana) was strangled to death by her boyfriend at age 22.
Hoping to ward off evil for the sequel, actor Will Sampson performed an exorcism on the set of Poltergeist II, but apparently, it wasn't enough. Within a few years, actor Julian Beck died of stomach cancer at age 60, and Sampson himself died of kidney failure at 53. Perhaps most shocking, Heather O'Rourke ("They're here") died of cardiac arrest due to a misdiagnosed intestinal condition, just a few months before the release of Poltergeist III. Sadly, she was only 12.
Unfortunately, the curse wasn't done. Richard Lawson barely survived a plane crash that killed 27 people, and in 2009, Lou Perryman was viciously murdered by a car thief. Hopefully, the curse has fizzled out now, but still, watch your back, Craig T. Nelson!