April Fools' Day or All Fools' Day is an annual custom on 1 April consisting of practical jokes and hoaxes. Jokesters often expose their actions by shouting "April Fools!" at the recipient. Mass media can be involved with these pranks, which may be revealed as such the following day. The custom of setting aside a day for playing harmless pranks upon one's neighbour has been relatively common in the world historically. Although many theories have been proposed, the exact origin of April Fools' Day is not exactly known. A disputed association between 1 April and foolishness is in Geoffrey Chaucer's The Canterbury Tales (1392). In the "Nun's Priest's Tale", a vain cock, Chauntecleer, is tricked by a fox "Since March began, full thirty days and two," i.e. the 32nd day from 1 March, which is 1 April. However, it is not clear that Chaucer was referencing April 1st since the text of the "Nun's Priest's Tale" also states that the story takes place on the day when the sun is "in the sign of Taurus had y-rune Twenty degrees and one," which would not be 1 April. In 1508, French poet Eloy d'Amerval referred to a poisson d'avril (April fool, literally "April's fish"), possibly the first reference to the celebration in France. In 1686, John Aubrey referred to the celebration as "Fooles holy day", the first British reference. On 1 April 1698, several people were tricked into going to the Tower of London to "see the Lions washed". April Fools' can be good for one's health because it encourages "jokes, hoaxes ... pranks, [and] belly laughs", and brings all the benefits of laughter. Many "best of" April Fools' Day lists showcase the best examples of how the day is celebrated. Various April Fools' campaigns have been praised for their innovation, creativity, writing, and general effort.