Today is first April which is also known as April Fool’s day! I have never played that day, never fooled anyone with that. But many incedents of fooling people on this particular day has happened around me. I remeber when I was a child, one of my uncle called my mom on one April 1st noon and told her that my dad had an accident, when she had totally lost control and started crying the uncle was satisfied and scearmed “April Fool!!!”. I find it very stupid way of fooling around people. On a particular fool day fooling around people just becasue it is a “Fools Day” does not make sense to me, rather those who fool others seems fool to me 
Anyway, was just goign throught the history and origin of April Fool. Many roots are there among them the follwing is mostly believed: (Resource: http://www.museumofhoaxes.com/aforigin.html)
The Calendar-Change Theory
The most widespread theory about the origin of April Fool’s Day involves the Gregorian calendar reform of the late sixteenth century.
The theory goes like this: In 1582 France became the first country to switch from the Julian to the Gregorian calendar established by the Council of Trent (1563). This switch meant, among other things, that the beginning of the year was moved from the end of March to January 1. Those who failed to keep up with the change, who stubbornly clung to the old calendar system and continued to celebrate the New Year during the week that fell between March 25th (known in England as Lady Day) and April 1st, had various jokes played on them. For instance, pranksters would surreptitiously stick paper fish to their backs. The victims of this prank were given the epithet Poisson d’Avril, or April Fish. Thus, April Fool’s Day was born.
The calendar change hypothesis might provide a reason for why April 1st specifically became the date of the modern holiday. But it is clear that the idea of a springtime festival honoring misrule and mayhem had far more ancient roots. In addition, the process by which the observance of the day spread from France to protestant countries such as Germany, Scotland, and England is left unexplained by this theory. These nations only adopted the calendar change during the eighteenth century, at a time when the tradition of April Foolery had already been well established throughout Europe. Finally, it is not clear what evidence, besides conjecture, supports the theory. For which reason, while there’s certainly a possibility that the calendar-change hypothesis contains a germ of truth, it should not be regarded as fact.
