HURRY! Get a FREE Coffee or Cold Brew at Dunkin' when you add the code THISISNOTAJOKE in the Dunkin app, for a limited time! Open the app, tap on Offers, then scroll down to ADD A PROMO CODE and enter the code above. Your April Fools Day Coffee and Cold Brew rewars will be added and valid until 4/08/2025 on a small, medium or large coffee or cold brew. Not valid on Nitro Cold Brew or espresso drinks.