Synchronicity, coined by Carl Jung, is the term parapsychologists use for ";meaningful coincidence."; As some measure of the magnitude of synchronous phenomena associated with a particular disaster, no less than 899 persons who initially booked passage for Titanic's maiden voyage eventually refused to board her because of warnings they experienced in the forms of various omens, premonitions, dreams and precognitive events. An additional 4,066 would-be passengers either missed the boat or canceled their reservations, usually under apparently normal circumstances, but sometimes through unusual coincidences that prevented them from sailing.