In 1940, Sherb Noble made fast food history with the opening of the first Dairy Queen location in Joliet, Illinois. To celebrate its 80th anniversary, Dairy Queen is offering buy one, get one for $.80 Blizzards now through March 15, 2020, WIVB reports.

The deal applies to all available Blizzard flavors, including M&M's, Oreo, and chocolate chip cookie dough. While Dairy Queen is celebrating its 80th birthday this year, the chain's signature Blizzard has been around for less than 40 years. Franchise owner and Blizzard creator Sam Temperato was inspired by the St. Louis institution Ted Drewes Frozen Custard, which served its "concretes" to customers upside-down. This gimmick was meant to demonstrate how thick the product was and to prove it wasn't watered down.

In 1983, Temperato went to Dairy Queen executives with his own take on the concretes. Like the items sold at Drewes, they would be served upside down, but instead of plain custard, they would contain chunks of candy bars mixed into the ice cream. The chain sold 100 million Blizzards in 1985 alone.

To get a special deal on the iconic treat, you can head to a participating Dairy Queen location any time now through Sunday. Here are some more facts about the fast food giant.

[h/t WIVB]