Three Dunkin' Donuts locations in Philadelphia and Cincinnati took part in the free coffee promotion on Tuesday. On Wednesday, Dunkin' Donuts a handful of locations in three cities -- St. Louis, Nashville, and Springfield, Massachusetts -- will be offering the free joe. Again, not every Dunkin' Donuts in the country is partaking in the festive caffeine frenzy, so make sure you check the aforementioned list before you start demanding free coffee. The holidays are already stressful as it is. Don't be that person.