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Imagine pegging your brother with eggs and tomatoes and not getting in trouble. Sound like a dream? Not for kids celebrating Carnaval (Mardi Gras to us), the festival that precedes Lent. (Today is Fat Tuesday, the day of revelry before Ash Wednesday, the first day of the Christian season of Lent.)

Carnaval celebrations include parades, dances–and plenty of opportunities to throw stuff. In Venezuela, kids throw eggs and tomatoes at one another.Kids in Columbia pitch hollowed eggs filled with colored water. Spanish kids toss flour and bran. And Mexican children pelt each other with cascarones.

Cascarones are eggshells filled with confetti. They are popular in Mexico and parts of the United States. The shell is decorated like an Easter egg and then cracked over somebody’s head for good luck. Here’s how you can make the confetti-filled eggs:

1. Take a pin and stick it through the top of the egg. Make the hole bigger by tapping it with the tip of a pen or pencil.

2. Make a hole at the bottom of the egg.

3. Hold your egg over the sink and blow through the top hole.The yoke and white will drain out the bottom.

4. Let water run through the egg to rinse it out. Set the egg aside to dry.

5. Throw out the safety pin and pen and clean out the sink, because raw eggs can spread germs.

6. Once your egg is dry, decorate the outside with markers or paint or dye it like an Easter egg.

7. Use a bit of glue or tissue to plug the bottom hole.

8. Fill the top hole with confetti. (Cut colored paper into small slivers, empty the paper circles out of a three-hole punch, or get out the paper shredder.)

9. Plug the top hole with a bit of glue or tissue paper. Let it dry.

10. Make a wish and crack the egg over a friend’s head.