India, April 1 -- In the spirit of April Fool's Day today, many are gearing up to prank their friends and family. While it may seem like a modern tradition, its roots go back to the 16th century. One widely believed origin story goes back to a funny incident all the way in 1500s France. When the Julian calendar (established by Julius Caesar) was replaced by the Gregorian calendar (introduced by Pope Gregory XIII), New Year's Day shifted from April 1 to January 1. However, not everyone got the memo and continued celebrating the new year on April 1, earning them the title of "April Fools."

Curious to learn more? We dug into some facts about Fools' Day, and the results are bamboozling.

1. In the UK, jokes and tricks can be played up until ...