The holiday commemorates the Mexican army’s victory over French forces at 
the Battle of Puebla on May 5, 1862.

April Fools’ Day, sometimes referred to as All Fools’ Day, is not a national
holiday, but is widely recognized and celebrated as a day when people play 
practical jokes and hoaxes on each other.

In Italy, France and Belgium, children and adults traditionally tack paper fishes
on each other’s back as a trick and shout "April fish!" in their local languages.

The original Paas Easter egg dye was invented in1893 by William Townley.
a drug store owner in Newark, New Jersey. He concocted recipes for home
products and figured out how to concentrate dye in tablet form and made
the modern Easter egg dyeing kit. The original price of each tablet was
five cents and customers would make the dye by combining the tablets
with water and vinegar. Townley eventually renamed his business the
Paas Dye Company. The name Paas comes from “Pasen,” the word
used by the Dutch for Easter. Paas is the largest manufacturer of
Easter egg dyes.