To celebrate the opening of its 100th location (hello, Boston Seaport), NYC-based burger chain Shake Shack is giving away 100 ShackBurgers to its first 100 customers at every Shake Shack location in the world. The giveaway starts at 10:30 a.m. Which means you probably better get in line pretty soon at the South Lamar Boulevard and Domain locations in Austin if you want that free grub. Pro tip: If they’re all out of free burgers by the time you get to the front of the line, try the Chicken Shack, one of the best fried chicken sandwiches in town.


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