European Vacation, the Griswold family wins the vacation on a game show called "Pig in a Poke". See also Cultural references to pigs Green goods scam Lipstick on a pig Impulse purchase References Bibliography E. Cobham Brewer, Dictionary of Phrase and Fable. 1898. Funk, Charles Earle, A Hog on Ice: & Other Curious Expressions. HarperResource, 2002. . Confidence tricks Deception English-language idioms Metaphors referring to pigs