[To Wit!] Pop rocks
The retro candy confection known as Pop Rocks are made by bubbling carbon dioxide through a solution of molten sugar (mixed with some color and flavorings), which traps the gas as the sugar hardens. It was invented in 1956 as a potential mix-in for Kool-Aid, but didn't work very well and so sat on the metaphorical shelf until the 1970s, when someone had the unprecedented idea of just shoving the damn things in your mouth. And the rest is history.