(TrendHunter.com) This Shake Shack shake deal has been launched by the brand to offer patrons a way to enjoy ample dessert when visiting solo or with a friend. The buy-one-get-one offer is available only at night... (TrendHunter.com) This Shake Shack shake deal has been launched by the brand to offer patrons a way to enjoy ample dessert when visiting solo or with a friend. The buy-one-get-one offer is available only at night...