It’s 7-11′s “birthday” (7/11) today, and everyone knows what that means: free 7.11-ounce Slurpees from 11am to 7pm at any and all 7-11s. Are you getting the brand messaging, people? One seven, two ones, blue mouth, no money. Today.

To celebrate record-breaking heat, sticky hands and corporate giveaways, we thought we’d present a brief history of this great holiday:

Slurpees themselves have only been around since the late 1950s, when a guy named Omar Knedlik’s soda fountain broke, forcing him to store sodas in the freezer. After finding that the drinks became slushy and enjoyable, Knedlik commissioned the help of marketing-wiz/artist Ruth E. Taylor, who created the name and logo for the ICEE, an early form of the drink which used a car air conditioner to cool.

Then in 1965, ICEE entered into a licensing agreement with 7-11 under the condition that 7-11 use a different name and only sell it at their stores. In 1967, 7-11 agency director Bob Stanford came up with the name Slurpee.

America loved it, and subsequently grew very fat, red-in-the-mouth and addicted to sugar; and corporations cashed in by creating a national holiday for every kind of junk food, including Slurpees. The end!

Now your only challenge will be tracking one down, which shouldn’t be a challenge at all considering they have over 8,200 stores in the US. 7/11 only comes once a year—celebrate their growth and ours over a free, icy electric blue drink.