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Shake Shack has scary good specials throughout the month of October! Now through October 31st, buy a Double Shack Burger & get one FREE when you use promo code: SPOOKY! Their signature burger is piled with 2 100% Angus beef, American cheese, lettuce, tomato, and ShackSauce, it’s a double helping of a classic to cap off spooky season and head into Halloween! Don’t forget they have a free Chicken Shack sandwich with a $10 purchase on Wednesdays.