The tricky part of this is finding eggs that don't have vent holes in them. We found some at Hobby Lobby that are mini eggs for $0.99/bag!
Then you need antacid tablets broken up into small pieces.
Evin is showing off his tabs.
Add colored water to the deep side of your egg. If you want the explosion to leave a cool design on the pavement add cornstarch to your water. Just a tablespoon or two/bottle.
Then drop your tabs in and cap your egg as fast as you can!
We had more fun with our explosions if we threw the eggs.