Cascarones (in Spanish "cascarón" means an eggshell) are hollowed-out eggs usually filled with confetti or. Cascarones are very popular in Mexico, but also in the southwest of the USA where there is a large Mexican community.
People usually throw cascarones at each other. They can be broken over someone's head too. It is believed that this act means good luck. Cascarones are a popular part of numerous festivities like birthdays, Day of the Dead, Cinco de Mayo or weddings. Cascarones used at weddings are filled with birdseed.