Place a pick up order and get a FREE Shake Shack Shake when you buy one with the discount code TWOFORFUN! Offer only valid for qualifying orders scheduled for pickup between 2pm and 5pm (local time of the Shack) through 3/27/2024. One time use per order. Max savings of up to $6.79. Must add a combination of at least two (2) Shakes (including any Limited Time Offer Shakes and Non-Dairy) to cart prior to checkout.