How about when you pay them. Hand them a fin for an extra large cream NO SUGAR and 2 plain donuts, total; $3.12. They hand you the dollar in one hand and the 88cents are cupped in the other hand. (they are expecting you to give them the change)When you keep your hand out for the change they look at you like ya are a cheap SOB.
What gives, Dunkin Donuts used to have a sign on their display NO TIPPING ALLOWED If it is less than 25cents I let them have the change sometimes but almost a buck for pouring me a cup of coffee NOT