Though no one knows the exact origin of April Fools' Day, it likely has its roots in Roman history beginning with the festival Hilaria, or from the Medieval Feast of Fools. These were festivals in which the lower class would often dress up and impersonate the kings and queens and not have to worry about getting their heads chopped off, at least for a day. The earliest recording of April Fools' Day is in Canterbury Tales in 1392, so it's been around a little while.
April Fools' Day is celebrated in several countries. In Italy and France, they might pin a paper fish on your back and yell, "April Fish!" Who knows where that tradition came from!
Now, you might get pinched or tricked, but depending on your friends and family, you might get something far worse! Here's a list of some of the best, not too harmful, April Fools' Day pranks out there. Go ahead, vote for the ones you might play on a friend or co-worker. If you do, you'll become filthy rich, I guarantee it! (April Fool!)