Fool's Day or April Fool's Day is an international holiday, celebrated around the world on April 1. On this day it is customary to play family, friends and just acquaintances, or play a trick on them.
April Fools' jokes are extremely diverse and cover wide strata of both joking and those who are joking. The most famous April Fool's Day pranks have already been classified into the list of 100 April Fools' jokes of all time, including: the fall of the Tower of Pisa, a photo report about flying penguins, the landing of a UFO in London, the transition to a decimal system of time measurement, a change in the Pi number from 3.14 to 3.0, and others.