Poisson D'Avril
You won't find many chocolate Easter bunnies in France, but the French delight in chocolate fish. Poisson d'Avril start appearing in shops on April 1st. The children use paper versions and try to stick a paper fish on the back of as many adults as possible, then run away yelling, "Poisson d'Avril!" (April fish - not April fool as it is here).
Some say this centuries old tradition evolved from sending a stooge to market to buy freshwater fish when it wasn't in season. In France, only a "fool" wouldn't know what produce was in season!
