This holiday season Clark Griswold vows his clan will enjoy "the most fun-filled old-fashioned family Christmas ever." Before you can sing "Fa-la-la-la-lah," he decks the halls with howls of folly in the perennial favorite National Lampoon's Christmas Vacation. Seeing is believing. There are 25,000 lights on the roof. An exploding turkey on the dining room table. A SWAT team taking siege outside. A festive supporting cast and a John Hughes script full of wit, heart and sheer goofiness. Yule love it!