I learned in the first year of our marriage that my husband is the ultimate prankster and if I wanted to do anything for April Fool's, I had better watch my back :).
Did you know that in France, the tradition is to give each other fish shaped chocolate on April 1st? They don't call it "April Fool's", they call it "Fish of April". I'm not sure why.
In case you can't find any chocolate fish laying around, here's a lovely assortment of pranks from some talented Etsy sellers: