April Fools Day

There doesn't seem to be any well documented facts about how this day became a day for foolishness, but many conjectures. One being the turn of the seasons creates a lightheartedness, causing people to be silly and wanting to play pranks. Another is that when the Gregorian calendar replaced the Julian calendar, New Years Day changed from April 1st to January 1st. The people who refused or didn't know of the change were called fools.
I talked a little about Spring Fever in a post from 2008. I don't know why people say that many hearts turn to love in Spring, but maybe for some this day is to tease those who become fools for love.