Holy Innocents' Day

Holy Innocents' Day, when practical jokes and pranks can catch you by surprise at every turn, is held on 28 December every year. You can find a paper doll hung on your back, just as you can have your leg pulled reading a newspaper that has published a news item they have made up.
It appears this day of jokes has a pagan origin, although it has been linked to the slaughter of innocent children ordered by King Herod, according to St Matthew.