Double-D!
Home of the Spiffy Coolata.
Dunkin' Donuts is the only place in Waltham that stays open to any sort of reasonable hour.  Most of Massachusetts shuts down shortly before Topeka, Kansas (only in Topeka do the Late Night shows air at 9:30pm), sending downtrodden Brandeisians scurrying for the one haven of hope, the shining light of Double-D.  Just as Coke owns Atlanta & Starbucks owns Seattle, so Double-D dominates Boston.  These little pastry pantries are everywhere in the land they like to call "Mass".
I think poker winnings have funded everything I've ever bought at this place.

Take Your Egg & Cheese Crossaint Sandwich To Go...