April Fool's Day - April 1st
April 1st is the day people try to trick their friends, to make them behave like fools. Ranging from the elaborate practical joke to the obvious Your zip's undone the joker gloats April Fool when the unsuspecting victim falls for it. No one is exempt until noon but after that the joking must cease or the prank rebounds on the joker with the rhyme "April Fool is gone and past, You're the bigger fool at last." A favourite joke is to send someone on a fool's errand, a search for something that does not exist, a friend of mine was sent to buy tartan paint once. (来源：专业英语学习网站 http://www.EnglishCN.com)
In Britain, fooling at this time of year has gone on for centuries, however the origin of the custom still remains obscure. There are several theories to account for it.
One theory is that in Europe, until the sixteenth century, March 25th, the first day of the Vernal Equinox Festival, was New Year's Day. On April 1st, the last day of the festival, people used to give presents to one another. In 1564, Charles IX, the French king, adopting the Gregorian calendar and fixed January 1st as New Year's Day. Those who were against the revision continued to express their complaints by giving presents or paying New Year's visits on April 1st. In the following years, these traditionalists who insisted on celebrating the New Year at its old time were mocked as fools and people would play pranks and tricks on them and called them ` Poisson d'avril ', meaning April Fish. This must have been so much fun that it spread all over the world and people played tricks on everyone, not just the people who didn't accept the new calendar.
Other people say it's just a continuation of a festival in honour of the Celtic god of Mirth but most popular belief is that it's a reaction to the change in season and the start of spring. Whatever its origin, making fools of people on this day remains one of the most flourishing of all British customs.
In Scotland, for example, April Fool's Day is actually celebrated for two days. The second day is devoted to pranks involving the posterior region of the body. It is called Taily Day. The origin of the "kick me" sign can be traced to this observance.
Even the television stations and newspapers get in on the act.
Some of the more famous April Fool's include.
A report that hawks carrying cameras would be used on the motorways by police to catch speeding motorists.
A news report about sheep with grass growing on their backs because the weather was so wet.
Numerous news reports about official sightings of the Loch Ness monster.
A documentary on Spaghetti was broadcasted a few years ago by the BBC claiming that sphaghetti grew on trees .
Some companies get in on the act too - BMW run a spoof advert every year.
A full-page BMW car advertisement was run on On 1 April 1986, about their new car for driving between Great Britain and the Continent. It was both left and right hand drive, had pedals on both driver's and passenger's side, had a detachable steering wheel which could go either side and a full set of instruments on each side, the unused one being covered by a lovely walnut panel. (I would have bought one!)
A mechanism that inflated the car tyres automatically was described by BMW one year.
Even the most serious Brits can't resist, the British magazine, New Scientist , often puts April Fool articles in their issue near the 1st of April. The rest of the magazine would have the correct date at the top of the page, but this page would have "1 April" at the top.
Basically don't believe anything you read, hear or are told on April 1st!
April Fool's Jokes In 2004
CBBC's Newsround website claims the planets of the Solar system will be renamed after characters from The Lord of the Rings - Earth will be named Gandalf.
Both The Independent and The Today Programme claimed Brian Eno had crafted an electronic remix of the theme tune of the radio soap opera The Archers to replace the theme that had been used for over 50 years.
An advert by BMW claimed new 'SHEF technology' would allow car drivers to cook their evening meals whilst driving home.
The Sun reported that British Police were fitting hawks with speed cameras to catch lawbreaking motorists.
The Daily Mail included photographs purporting to be the Queen gambling on horse racing amongst her subjects at a local Bookmaker.
Google announced to start interviewing candidates for their new lunar hosting and research center. An email to the address listed return.
April Fool's Jokes In 2005
MozillaNews reported that Google would be acquiring the Mozilla Foundation, as a whole.
BMW printed a full page ad in a number of national UK newspapers (including The Times, The Guardian, The Independent, and the Daily Mail) saying that in 2007 the EU was to ban right-handed cars being driven in mainland Europe (effectively banning every British car), and that they had invented steering wheel-less technology.