1. Everything!
And so, after a whole host of nightmare inducing clips and pictures of traditionally non-scary things, I have come to the conclusion: that movies have the power to make us fear everything... and the things I've listed cover just a handful of those things. Whether it's girls with long black hair, phone ringtones, laser eye surgery or swinging signs, there is definitely a film out there to make you shudder at the thought of something inherently unscary. And it's somewhat sad to say (or is it good?), but movies are just getting scarier and scarier as time presses on - before long you won't even be able to drink a glass of water without freaking out a little bit.
If you think I've missed anything important or if you can honestly say you're not terrified at the thought of anything on this list, then let me know in the comments below.