You play a trick on someone today in the Francophone world: Fish of April!
Hide your wife's keys: Fish of April!
Find shaving cream in your shoes or Saran Wrap over the toilet seat: Fish of April!
I don't know why they say "Fish of April." But I think we should mix it up a little bit this year, à la française. Just go around saying "April Fish!" today and see what happens. I'll bet you it will never dawn on anyone that you're just playing an awesome April Fool's joke that only you and I will understand. Let's just keep it between us.