Today's writing prompt seems appropriate as I lay bed with my fourth cold of the season...
Write a short sketch of a scene in which a character has an experience that causes her to recall a startingly similar past experience. Juxtapose the present scene and the past scene on top of each other, writing, for instance two or three sentences of the present moment, then alternating back and forth between present and past that way. You could show the reader the remembered scene by use of italics. Why would a character be haunted like this? Think of a convincing reason for the deja vu experience--don't tell it but make the reason a basis for the details. Or don't worry too much about convincing reasons--just let a strange set of events impinge on the present moment of your character. Be playful with the relationship. 500 words
--The 3 A.M. Epiphany: Uncommon Writing Exercises that Transform your Fiction, Brian Kiteley (Writer's Digest Books, 2005)