I didn't say they're any GOOD, I said they're FREE. And it's HOT! And you can reuse the cups!
 Slurpee historyMachines to make frozen beverages were invented by Omar Knedlik in the late 1950s. The idea for a slushed ice drink came when Knedlik's soda fountain broke down, forcing him to put his sodas in a freezer to stay cool, which caused them to become slushy. Many people loved them, which gave him the idea to make a machine to help make a "slushy". When it became incredibly popular, Knedlik hired artist Ruth E. Taylor, to create a marketing name and logo for his invention. She came up with ICEE and designed the original logo, which is still used today. Early prototypes for the machine made use of an automobile air conditioning unit. In 1965, 7-Eleven began a licensing deal with The ICEE Company to sell the product under certain conditions. Two notable conditions being, first, they had to come up with a different name for the product, and second, were only allowed to sell the product in 7-Eleven locations in the U.S. The latter being a non-compete clause ensuring the two drinks never went head to head for distribution rights. 7-Eleven then sold the product that in 1967 became known as the "Slurpee" (for the sound made when drinking them). The term was coined by Bob Stanford, a 7-Eleven agency director.
The Slurpee machine has a separate spout for each flavor at the front of a tumbler or freezer, where patrons pour their own Slurpees, whatever the flavor. When Slurpees were first introduced, the dispensing machine was located behind the counter, and the clerk on duty would be tasked with dispensing the product. Common flavors are frozen Coke, Mountain Dew, and cherry, but new flavors are introduced regularly. In the Slurpee's early history, flavors rotated much more frequently than they do currently.
A dual-chambered Slurpee cup was announced for June 2011 release which uses a double straw and switchable valve to allow consumers to drink either of the flavors alone or both flavors simultaneously.