Snap, crackle, marble pop!

Ramune is a brand of pop from Japan. It's sold in Codd-neck bottles and sealed with a marble that is held in place by pressure from carbon dioxide. To open it, you push the marble into the drink, where it rattles as you drink, or you catch it on two little nodes to prevent the rattling. Very cool. I have yet to try it, but I saw an ad for it in World Market and found it really interesting.