Here's another: 'The clock stopped ticking. Then I heard a whisper say it was time for me to go.' This story uses the contrast between the normal function of a clock (ticking) and when it stops. The sudden silence can be eerie, and then the added element of the whisper saying it was 'time to go' gives a sense of impending doom. It makes the reader wonder where they are supposed to go and why. It also plays on our subconscious fear of time running out or something bad happening at a specific, unknowable time.
A good one is 'I woke up to see a figure at the foot of my bed. It disappeared when I turned on the light.'