On Thu, 1 Apr 2004 17:12:29 +0000 (UTC),
wrote:

Probably the best ones ever in Britain were the famous TV "spaghetti
trees" news bulletin on the plight of pasta farmers, and the Guardian
newspaper's supplement on the island nation of San Seriffe (think:
typography). I also fondly remember a Financial Times revelation that
cricket was invented by the ancient Greeks, a successful April Fool
because it was played entirely straight.

I liked the story I heard several years ago about Big Ben being
converted to a digital display.

Gordon