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circa 1971: A large Christmas peace message reading 'War Is Over !' from John Lennon and Yoko Ono on a billboard in New York City. The message, protesting against US involvement in the Vietnam War, is simultaneously displayed at Montreal, Toronto, Los Angeles and at six European cities. (Photo by Three Lions/Getty Images)

circa 1971:  A large Christmas peace message reading 'War Is Over !' from John Lennon and Yoko Ono on a billboard in New York City. The message, protesting against US involvement in the Vietnam War, is simultaneously displayed at Montreal, Toronto, Los Angeles and at six European cities.  (Photo by Three Lions/Getty Images)