Borrowing its concept from 1998’s Ringu, a hit in its native Japan, The Ring follows a journalist (Naomi Watts) investigating a videotape that supposedly kills anyone who watches it. The movie’s narrative is a bit patchy at times, but there are enough genuine scares to keep your teeth clenched. And the malevolently open-ended finale, like that of all good horror films, makes you walk out of the theater fearing you might be the next victim.