Poisson d'Avril !!
Have a great day with Duo Lingo. May you gain many Lingots.
In case people don't know "poisson d'avril" is the French term for April's Fool. Apparently children will try to stick a paper fish to someone's back (like a kick me sign) and they walk around like that until someone shouts out "poisson d'avril!".
Here are some pages on it:-