Couldn't possibly formulate a poll for this one as there are simply so many genuinely frightening films to choose from and obviously what some may find terrifying others find.... umm, not.
Anyway, The Changeling (1980) starring George C Scott was for me pant soilingly scary and more recently Ringu (1998) by Hideo Nakata.
Anything by Michael Winner scares the shit out of me as well but for drastically different reasons.
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