ddelmonte writes with a link to a brietbart story on the
top ten April Fools Day hoaxes, as determined by the San Diego-based Museum of Hoaxes. Two great British examples:
"In 1957, a BBC television show announced that thanks to a mild winter and the virtual elimination of the spaghetti weevil, Swiss farmers were enjoying a bumper spaghetti crop. Footage of Swiss farmers pulling strands of spaghetti from trees prompted a barrage of calls from people wanting to know how to grow their own spaghetti at home. In 1977, British newspaper The Guardian published a seven-page supplement for the 10th anniversary of San Serriffe, a small republic located in the Indian Ocean consisting of several semicolon-shaped islands. A series of articles described the geography and culture of the two main islands, named Upper Caisse and Lower Caisse."