At the beginning of "National Lampoon's European Vacation" the Griswold family appeared on a game show called "Pig in a Poke" standing cheek by jowl in matching pink pig costumes as Chevy Chase, portraying the clueless family head Clark Griswold, brashly decided to risk the family's winnings by playing for the grand prize. Unexpectedly pitted against the show's all-time winningest family, things looked bleak for the Griswolds when they were asked to name the lieutenant who led the famous expedition to the Pacific Northwest in 1804. Completely stumped when asked for the final answer, Ellen