Fruit ice. Fact: It was invented by an 11-year-old boy who kept the recipe a secret for 18 years.
Frank Epperson accidentally left a mixture of powdered soft drink flavor and water on his porch in 1905, with a stirring stick left in it. That night the temperature in San Francisco dropped below zero. When he woke up the next morning, he found the drink frozen. After that, he tried to freeze the juice with a stick inside the mold. 18 years later, Frank patented his invention called Popsicle.