I have, however, been plotting a prank of my own for the Wonder Boy (WB), to start off something which I hope will be a playful tradition between us for the years to come. Earlier today, I've arranged for him to anonymously receive a package containing a vial of "magic" potion, and a set of simple instructions which he can read and follow all by himself. Long story short, he'll have to pour the potion into a bowl and then take a nap to 'activate' the magic that will turn the potion into treasure.
Between you and me, the potion is simply some diluted food coloring and the treasure will turn out to be a bowlful of candy, chocolates and small toys. The best part is that when he gets a bit older, he'll figure it out eventually-- and hopefully it'll turn into a fond childhood memory down the road.
Do you have any loving traditions-- April Fool's or otherwise -- that you've started for your kids?