April Fools' Day (sometimes called April Fool's Day or All Fools' Day) is celebrated every year on the first day of April. Popular since the 19th century, the day is not a national holiday in any country, but it is well known in Europe, Australia, Brazil and the United States, and it is celebrated as a day when people play practical jokes and hoaxes on each other. The jokes and their victims are known as "April fools". Hoax stories may be reported by the press and other media on this day and explained on subsequent days.
In Ireland it was traditional to entrust the victim with an "important letter" to be given to a named person. That person would then ask the victim to take it to someone else, and so on. The letter when finally opened contained the words "send the fool further".