Today 7-Eleven plans to give away 5 million free Slurpees to customers. In the spirit of the date and the store’s name, each free drink will come in a 7.11-oz. cup, and 7-Eleven plans to give out 5 million in the US and Canada.

Now some history! The 9th annual "7-Eleven Day" marks the chain’s 84th birthday. The first 7-Eleven opened in 1927, when an employee of an ice company near Dallas started selling bread, milk, and eggs on an ice dock. Other Slurpee milestones listed on the chain's website include the coining of the name “Slurpee” in 1967 by a 7-Eleven agency director. They're great on a hot summer day, but watch out for " brain freeze'!