I'm not the type to get scared by ghost stories or the like, but watching Paranormal Activity alone, on a laptop, with headphones was not y best experience! DH was out, I was alone with twin newborns (had a monitor for them). Shit myself up when DH came home.
Signs scared me shitless for some reason - the bit when the aliens were walking round the house. I was staying with a friend, was NOT drunk (or anything else) - still not sure why it freaked me out so much!
The thing I am most afraid of is home invasions, or waking up to find an unknown person in the house. Or a person LIVING in your house without you knowing.
Black Christmas (the original) is the scariest film for me, despite being lacking in gore (which doesn't scare me, just disgusts me!). I watched it on Christmas Eve a few years ago and had nightmares all night.
I did think the Babadook was scary, but in a 'this could happen to anyone' sort of thoughtful comment on mental illness way.
The Orphanage was just the saddest film ever
. I cried for about an hour after watching that. Very well made.