Midway through a recent screening of "Vacation," the lights in the theater unexpectedly came on, leading this viewer to wonder: Can I go now?Alas, darkness descended once again, leaving the audience stuck in the mindless hell that is the Griswold family, bumbling toward Walley World.Part remake, part sequel, the movie follows Rusty Griswold, the son in the original 1983 "National Lampoon's Vacation.