Wikipedia has this amusing trivia:
"They are rumored to have originated in China and brought to Europe by Marco Polo. In Italy they were first used as a courting ritual, filled with perfume and then capped with wax. Men would throw them at women they found attractive. "
(Because there's nothing sexier than a guy throwing an egg at you, especially with the subtext, "I thought that you could use some perfume to cover the fact that you need a bath.")
Ben asked the next day if he could open the second pack of cascarones (or as he calls them, "fiestas"). Since they're kind of messy, we told Ben that we'd wait for a nicer day and open the second pack outside. He did not like this and decided to write an angry response on his Magna Doodle. He says it reads:
"Bad Mom said do not let me do my fiestas."
At least he's practicing his writing skills.