Dateline, Japan: Jealous of his wife's love for another man, a man brutally kills his wife and young son. Better than the Sarah Michelle Gellar slog-fest ("The Grudge") that followed this flick, "Ju-on" is edgy — it even allows you some time to get comfortable before the heavy breathing, black blood, and phantasmagoric preschoolers start popping out of the woodwork like drunk termites. Put on a helmet, and dive in.