What do you call someone who’s fallen for a prank? There’s no punchline here — in most English-speaking places, you’d probably just call them gullible.
But in France, you might use the term poisson d’avril, aka “April fish.”
The centuries-old name is linked to a 1508 poem by Renaissance composer and writer Eloy d’Amerval, who used the phrase to describe the springtime spawn of fish as the easiest to catch.
Young and hungry April fish were considered more susceptible to hooks than older fish swimming around at other times of year. Today, celebrating “April fish” in France — as well as Belgium, Canada, and Italy — is akin to April Fools’ Day elsewhere, complete with pranks; one popular form of foolery includes taping paper fish on the backs of the unsuspecting.