They say nobody believes in curses until they wind up living under one. Just ask the cast and crew of the following movies that have gone down in Hollywood lore as "cursed" productions. Of course you can't ask some of them, since they're now dead. From the curse.
Or maybe it's all just bad luck. You be the judge.
6The Poltergeist Trilogy
Everyone who appeared in the poltergeist trilogy is now dead, says an extreme and entirely untrue version of the poltergeist curse. Indeed, Nancy Allen, (Robocop's sidekick), is very much still alive. It's just her career that's dead. What is true is that four of the trilogy's actors all died within 6 years of the first movie, giving rise to talk of The Poltergeist Curse.
Supposed deaths include child actor Heather O'Rourke, who appeared in all three films and died just before the third film was released. Suffering what was thought to be the flu, she was taken to hospital and later died on the operating table from complications. Then, Julian Beck, (who played the terrifying old man in Part 2), died of cancer...
... and Native American actor Will Sampson died during an operation (note that he was wanted at the time for the suffocation of a lobotomized Jack Nicholson and vandalism of state property).
Then we have Dominique Dunne (who played the oldest child in the first film) who was strangled to death by her boyfriend the same year the film was released. That's where the "curse" starts to get shaky, since that seems less like supernatural misfortune and more like having a shitty, murderous boyfriend.
So what did the film makers do to supposedly piss off the spirits? Well, they used real human remains as props in the first Poltergeist movie. You know, the movie about how desecrating the remains of the dead angers their spirits.
What sucks about that is that none of the supposed curse victims were actually involved in the decision to use real human remains on the set. Doesn't it ruin the whole point of a curse when you go inflicting it at random? That's just sloppy.
Most Tenuous Link to the Curse:
According to a noted expert on the film (Read: Wikipedia) JoBeth Williams, who played Diane Freeling, claims she returned home from the set each day to find pictures on her wall askew! She would then straighten them out, only to find them crooked again the next day!
Supernatural or not, it's just shitty curse work when you have to use a laser level to even figure out it's going on.