Fools' Day

April 1st is Fools' Day in many countries around the world. People usually play jokes or pranks on family and friends, and then they say "April Fool".
Different places play pranks in different ways; for example, in Scotland children put a paper on a friend's back, the paper says "Kick me". Another popular joke is to invite a friend to a party when there is no party. Also, newspapers, magazines or news reports publish incredible fake stories.
It seems that all started when the official Julian calendar, which celebrated the beginning of the year on April 1st, was changed into the Gregorian calendar in 1582, which set it on January 1st, as it is nowadays. At that time, news travelled slowly and it took a long time for people to know or get used to the new dates. As a result, some people still celebrated 1st April as the new year, so the rest called them "April Fool"; later the jokes and tricks developed and the tradition continues. Maybe your best friends turn funny on April 1st; you can think of pranks and jokes to play on people, but be ready to accept them too!
You can take a quiz about this date in  
   http://www.quizland.com/april-fools-day.htm