<P> People obeying hoax messages to telephone "Mr. C. Lion" and "Mr. L.E. Fant" and suchlike at a telephone number that turns out to be a zoo, sometimes cause a serious overload to zoos' telephone switchboards . </P> <P> Other examples of genuine news on April 1 mistaken as a hoax include: </P> <Ul> <Li> 1 April 1946: Warnings about the Aleutian Island earthquake's tsunami that killed 165 people on Hawaii and Alaska </Li> <Li> 1 April 2005: News that the comedian Mitch Hedberg had died on 29 March 2005 </Li> <Li> 1 April 2005: Announcement about Powerpuff Girls Z, by Aniplex, Cartoon Network and Toei Animation </Li> </Ul> <Li> 1 April 1946: Warnings about the Aleutian Island earthquake's tsunami that killed 165 people on Hawaii and Alaska </Li>

Where did april fools' day come from