h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

This smiley scares me:

For literary scariness, "The Owl Service" by Alan Garner freaked me out quite a lot when I was a kid. There aren't (as far as I can remember) any monstery things in it, it was just scary. "The Weirdstone of Brisingamen" was pretty frightening too.

As for films - the guys in space suits that come to get ET were scary.
Also, watching "Aliens" last night reminded me of how scared I was the first time I saw it (I was about 12, I think). Frightened the crap out of me for about a month afterwards. Still one of my favourite films ever ever though.

I can't remember what it was called, i'm sure some Whovian'll be able to tell me, but there's one prog of Dr Who that had this alien that kind looked like a pig (kinda similar to Piggy from Monkey - who come to think about it is kinda freaky too) but the very last scene of this episode this piggy alien comes out of its craft.... takes off its helmet and looks menacing... i think i screamed for weeks

plus the usual dolls and ventriliquist dummies.

There's a long sorid story of being 13 or 14 on holiday in tenerife. i was ill and while all the others had gone out and i stayed to read - stephen kings 'salems lot'. dozzing off after an evening of vampires i was woken up by the dog that had adopted us (that always happens) going ape on the veranda - well.... i bricked it so badly - ran into the bed room screaming. turns out it was the family returning from their night out having fun and thought it would be quiter if they came in the back way - nice of them eh?

i live in a house that's about 150 years old and twice a day: 6.30am and sometime in the early evening the water in the pipes makes an amazingly loud noise, sort of like really rumbly thunder. it lasts for about 5 seconds but for some reason i've never found it scary, but kind of comforting!
also, i watched The Green Mile and the bit where that man gets electrocted ( the one were they don't use water) gave me nightmares for AGES!

When I was about five or six I woke up because something was climbing over me. When I opened my eyes, I saw those huge glowing eyes hovering right above my face.
And I SCREAMED.
Err... turned out to be the cat. Was probably more scared than I was (wouldn't talk to me for days. Oh yes, we used to have some quite interesting conversations...).

i used to have a cat, and i'd often wake up with here on my face! cat hairs down you're throat are not nice! (specialy with a long-haired cat!)

Dogs were kind of scary, mainly because our family had such bad
luck with them. The first one got killed by a big truck, and I had to
accompany my mother down the street to put the dead dog in a wagon
and have it buried. The second dog was just mean, always snapping
at me.

For months I was scared by an episode of "The Outer Limits," in
which an ominous gift was left for a wedding couple. When the gift was
opened, it seemed to be a TV set, but when the groom looked
into it, there was an evil one-eyed extraterrestrial inside who zapped
him and sucked him into the TV. The poor bride spent decades
figuring how to get her husband out! It turns out that the extraterrestrial
was one of several frequencies that were supposed to blow up the
universe once they all got together. Nowadays, they would just
hire the vogons

we were digging up part of the lawn in our garden one day and we started unearthing some rather large bones, probably a large dog, but we never did find a skull.............