This is one of my favorite sequences (skip to 8:11 on the video) in a horror film: Laurie Strode (Jamie Lee Curtis) and Annie Brackett (Nancy Loomis) being followed by the Shape (Nick Castle), listening to "Don't Fear the Reaper" in Halloween. Debra Hill (the director and scriptor of this particular scene) captures an ominous transition from day to dusk. I watched this film last night and instantly got in the mood.
Happy Halloween! Tell me what your favorite horror scenes are.