April's - Fool

: A leading theory suggests the tradition began when France switched from the Julian to the Gregorian calendar. Those who continued to celebrate the New Year around April 1 (the spring equinox) instead of January 1 became the target of jokes and were called "April fools".

: Celebrations often last two days. The first day is "hunting the gowk" (sending people on phony errands), followed by "Taily Day," which focuses on pranks involving the backside, such as "kick me" signs.

: Some link the day to the ancient Roman festival of Hilaria , celebrated in late March with masquerades and "general good cheer" where participants inverted the social order.

: Pranks should not cause physical harm, damage property, or ruin someone's life.

: Large organizations frequently participate. A famous example is the BBC’s 1956 "spaghetti harvest" documentary, which convinced millions that spaghetti grew on trees in Switzerland. Best Practices for Pranking