To celebrate today, prepare your best pranks and practical jokes.
Some believe the tradition of April Fools Day began when people continued to ring in the New Year on April 1st because they hadn't heard about the calendar change. Each call sets up a different scenario - a stranger asking why you're leaving notes on their door, a random coworker asking if you can cover their shift - and follows a set script with Johnson's voice guiding the conversation. It makes reference to a custom in the kingdom of making fools of people on the first day of April and addresses the day as being the culmination of an eight-day feast and the beginning of a new year.
The United States has gotten particularly into the April Fools' Day tradition, with hundreds of companies putting on elaborate pranks each year. In Portugal, April Fools' Day is actually celebrated on the Sunday and Monday before Lent. Some people have been stockpiling prank ideas for months, whereas others are not as fond of this jokey holiday.
In the 19th century, the day was considered a children's holiday in Europe and North America. In certain areas of Belgium, children lock out their parents or teachers and only let them in if they promise to give them candies. The streets in London and NY were filled by children known as "street urchins" who devised all kinds of mischief.
But one thing's for sure - people have been playing jokes on April 1st for a very long time!
French revolution: April 1 is the anniversary of the French Revolution.
In 1957, the BBC reported Swiss farmers were experiencing a record spaghetti crop and showed footage of people harvesting noodles from trees.
Color TV: April 1, 1962. They simply needed to pull a nylon stocking over the screen. It has the same ingredients as the original Whopper but was rotated 180 degree to "ensure better grip on the bun".
"This is the day upon which we are reminded of what we are on the other three hundred and sixty-four".
April 1, 2013 - The Guardian announces the launch of its own augmented reality device, Guardian Goggles, which will "beam its journalism directly into the wearer's visual field, enabling users to see the world through the Guardian's eyes at all times".
One popular theory speculates many chose to ignore the new calendar and still celebrated on April 1.