7-Eleven Free Slurpee Day 2011: Where To Find The Offer

7-Eleven is giving out free slurpees today at locations nationwide in coordination with its 84th birthday (appropriately 7-11).

The convenience store chain plans to give out 5 million Slurpees in all, 7.11 ounces each, according to a news release. Senior Vice President at 7-Eleven Jesus Delgado-Jenkins says that's the most Slurpees the company has given out in a single day, with 3 million handed out two years ago.

The Slurpee is 7-Eleven's popular (and trademarked) drink that comes in dozens of flavors. Anyone who stops by a 7-Eleven today gets one for free, as in years past.

While the product may be free, USA Today notes that 7-Eleven typically sees a spike in sales on "Free Slurpee Day" and there's a reason for it: people often want more after the 7.11-ounce taste. Adds a professor:

"Free is magic," says Barry Schwartz, professor of psychology at Swarthmore College. "If you offer something for free, people will gladly spend money to get it."

The 7-Eleven franchise was founded in Dallas, Texas, in 1927 in Dallas, Texas. It now has more than 39,000 stores around the world, making it the largest convenience retailer.