A fantastical (and technically stunning) spin on a classic bedtime story, "Jack the Giant Slayer" doesn't tell us anything new, but some moments may give nightmares to the under-12s. The fee-fi-fo-fum ambience is there, but director Bryan Singer (of "X-Men" franchise fame) instead mostly turns the dials on terrifying sight gags (like very pointy blades aimed at vulnerable body parts) and terrifying giants that travel in packs and guzzle their favorite food, which is pigs in a blanket — literally.