Ramune is an unusual carbonated soft drink from Japan. It comes in a variety of flavors including peach, melon, and lychee.
Ramune's codd-neck bottle is vacuum sealed by a marble. When you use the provided plunger to dislodge the marble the soda can explode out the top. Even if you don't shake it.
Getting to that point can be difficult. Even with four-step directions printed on the back. You'll have fun watching newbies trying to open one. It's also nearly impossible to open if you throw away the plunger cap. Unless you have a pen, or you know, ingenuity.
To drink Ramune you have to keep the marble away from the neck so it doesn't block the flow.
I'm scared for people like you, who haven't tried it yet, getting stranded in the desert with an unopened bottle of Ramune. You should start practicing.
You can find Ramune in Asian restaurants or grocery stores. You can find Coca-Cola everywhere.