PARIS — April Fools' Day is an international celebration of silliness, with roots in ancient Rome, India and the first written reference in The Canterbury Tales. In France and Italy, the poisson d'avril and pesce d'aprile respectively, is a traditional call to spend the day trying to tape a paper cut-out of a fish on the back of an unsuspecting friend. There and elsewhere, the pranks have gotten far more elaborate. Here's a collection of five of the all-time best: