A while back (you can read it here) I found an interesting bit on io9.com regarding two sentence horror stories.  Several of the ones featured in the article were genuinely chilling.

Salon.com has now presented twelve examples of the same, two sentence (very) brief thrillers/chillers.

Enjoy!

http://www.salon.com/2013/10/30/12_novelists_tell_their_scariest_bite_size_stories/