On 1 April 1977, the Guardian published something that has become known as one of the finest April Fool’s gags in history: a seven-page supplement about the fictional, “semi-colonial” island of San Serriffe, complete with a map (at right) full of typographic puns and gags. The Guardian has a page on the gag and has reprinted a couple of the articles here and here; the Museum of Hoaxes has scans of the entire supplement.