I can't say that I do myself. The notion of a ghost is a little like God except that ghosts seem infinitely more believable, but in saying that my belief in ghosts lays at a relatively low 0%. When I was a kid I was more open to the idea and would sometimes frighten myself with my imagination going wild on too much fiction. As I got older though I found that nothing would happen when pacing the pitch black fields or when I would turn out the lights. No weird sounds, no changes in temperature, no strange apparitions. All a total nil. As an adult I am realizing all the things that made childhood bearable all amount to nothing and thus there are no ghosts either (well except for that sarcastic one with the creepy smiley thing).