What is a Smoke Bubble cocktail gun?

A Smoke Bubble cocktail gun is a device that is used to create a drink known as a Smoke Bubble. This drink is made by adding a flavored syrup to carbonated water. The drink is then poured into a glass, and a small amount of gunpowder is added to the drink. This gunpowder is then lit, and the drink will create a large number of bubbles that will emit a smoke-like vapor.

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