The billboards started popping up everywhere. In cities all over the world. In New York and Los Angeles. In Toronto, Rome and Athens. In Berlin, Amsterdam, Paris and London. In Hong Kong and Tokyo. The languages different, the message the same: WAR IS OVER! IF YOU WANT IT. Happy Christmas from John & Yoko. The message, of course, from John Lennon and Yoko Ono, the date December 15, 1969, a campaign devised to promote their anti-war agenda at a time when conflict raged in Vietnam.