Many people use April Fools' Day as a convenient excuse to lie, cheat, and trick their friends -- for fun, of course. The day has also also evolved in recent years into a massive Internet event, with brands like Google, Facebook, and Netflix rushing to prank their users in hopes of capturing the buzz of the day.
But have you ever wondered why at the start of April everyone turns into Ashton Kutcher from 2003?
It turns out there are actually multiple theories, and some are shrouded in mystery.
Click through some of the top April Fools' Day jokes from 2015:
Pranks gallery to add to April Fools' Day pages (fun photos only)
The origin and superstitions of April Fools' Day
Just a few hours left to get the all-new #SelfieStick for dogs! Buy it now: http://t.co/Rdh1l1vUve http://t.co/UHiu8upvJH
#PatriotsNation breaths a collective sigh of relief when they realize it's #AprilFools Day...http://t.co/S8NIq5AzLw http://t.co/rq9r3VDbUm
It's easy to find the poster I added, but I can't take credit for it. I read about some genius posting these around New York City. I found it hillarious, and so did anyone I showed it too. It went over pretty well... for a few hours. But once again, someone without a sense of humor took these down too.
Pedestrians walk through an "e-lane" Monday, April 2, 2012, in Philadelphia. Philadelphia Mayor Michael Nutter used April Fool's Day to have a little fun with what he says is a real problem: distracted walking. City officials painted lines and oblivious stick-figure pictures on one stretch of John F. Kennedy Boulevard near City Hall as a jab at pedestrians who keep their eyes on their cellphone screens and not their surroundings. (AP Photo/Matt Rourke)
This frame grab image released by Google shows the Google Nose site, a parody site in celebration of April Fools' Day. Having already debuted its wearable Google Glass, the company on Monday showcased âGoogle Nose,â adding scents to it search results. (AP Photo/Google)
A roll of paper towel frosted with icing and sugar confections to make it look like a real cake. Goes with April Fools Pranks story. (Photo By Karl Gehring/The Denver Post via Getty Images)
Legislative intern Luke Hansen works at his aluminum-foil-coverd desk at the Capitol in Bismarck, N.D., Friday, April 1, 2005. As an April Fools' day prank, fellow interns wraped Hansen's desk and everything on it with aluminum foil. Hansen is from Milwaukee, Wis. He is a second-year law student at the University of North Dakota. (AP Photo/Will Kincaid)
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One of the more popular theories on why we have April Fools' Day, or All Fools' Day, centers around the West's adoption of the Gregorian calendar during the 1500s, which moved the New Year from March 25 to the first of January.
According to this particular origin, if a person were to be deceived into thinking April 1 was still the day to celebrate the New Year they would be deemed the April Fool-- surely a boost to anyone's self esteem. Making such a mistake would earn you the title of town fool for the month.
The early Spring date fuels another another popular theory for the holiday's creation. According to the Encyclopedia of Religion and the Encyclopedia Britannica, nature "fools" mankind with unpredictable weather that the season brings.
Snopes.com also says others theorize it may be related to the Vernal Equinox, or even the "Romans' end-of-winter celebration, Hilaria, and the end of the Celtic new year festival."
There are even some superstitions surrounding the jokester holiday. Legend has it that if you perform a prank after noon on April 1, you can expect some bad luck in your future. Others insist you'll garner bad fortune if you can't take your April Fools' Day prank well, so you may want to try to avoid an overly salty reactions.
So make sure you get your April Fool's antics in before lunch time and hope your victims appreciate your well-planned high jinks in the morning.