April fools' day
April Fools' Day or All Fools' Day, though not a holiday in its own right, is a notable day celebrated in many countries on April 1.
The day is marked by the commission of hoaxes and other practical jokes of varying sophistication on friends and neighbors, or sending them on fools' errands, the aim of which is to embarrass the gullible. In some countries, April Fools' jokes (also called "April Fools") are only made before midday. It is also widely celebrated on the Internet.