The last thing I saw was my alarm clock flashing 12:07 before she pushed her long rotting nails through my chest, her other hand muffling my screams. I sat bolt upright, relieved it was only a dream, but as I saw my alarm clock read 12:06, I heard my closet door creak open.”
Source : http://canyouactually.com/9-of-the-most-terrifying-two-sentence-horror-stories-ever-told/