Burger Month 2019: Shake Shack’s Double Shackburger (with Cheese Fries and Black & White Milkshake) A out-of the way location. Having to wait a long line. Customers who are just there for social media likes. Is all of this worth is just to get a burger at Shake Shack? Closing out this year’s Burger Month is Shake Shack’s Double Shackburger.